Look for push out awnings or crank out awnings.

+1. I don't see anything particularly unique between that pic and the awning offerings of most manufacturers.
Regarding the size and style that you have, if you are set on preserving that style that's one thing, but if not you could easily switch configurations for that entire opening. Each option has pros and cons: 1) slider for price, a twin casement for performance, twin double hung for ease of cleaning and maintaining similar lines, or the existing quad awning which is probably the most expensive way you could possibly fill that opening-- but it does preserve the look.

Perfect! Thanks for the info

Would I have to purchase four individual windows to achieve this configuration or could it be purchased as one unit?

A slider would be one unit, the others would separate units either factory mulled, mulled on site, possibly inserted into the individual frames, or build your frames.
I would do a full frame and go with a slider or full frame factory mulled if the company is capable.
You may have egress issues with an awning if the windows are in a bedroom. The slider or casements with egress hardware would be your best bet if that is the case.

This window would be added to a sitting room in the back corner of the ranch style home to add additional light. If the home consists completely of push out awnings should I plan on purchasing another push out awning for this space? Would it be acceptable to install perhaps a picture window?

A picture window would let in the most light followed Bythe slider, casements , double-hung then awnings.
It should be the cheapest and most efficient type window as well.
I see no problem with a picture unless you want ventilation. With the window in the back different configerations will go more unnoticed.

I decided to go with a single panel awning rather than this quad configuration. The quote I received from BMC for a Marvin
72" x 36" primed pine interior and exterior, 1 lite, wood ultimate awning picture window was $682.76. Does this sound like a fair price, if so I'm getting ready to pull the trigger.
Thanks

definitely a good price. That is not a cheap window.

Apparently what I was quoted was for a "stationary awning window". What is the difference between a stationary awning, a push out awning or a picture window.

Stationary awning is a FIXED window, a push out awning would be just what the name implies. And a picture window is also a permanently fixed window.