Here is some info I googled for. Hope this will help!

Just break off the top and prepare it for immediate planting in your greenhouse or other warm
space with ample sunlight.

With your fingers, take off the green fronds nearest the broken end
for about one inch (2 1/2 cm), leaving the stalk exposed. Place in
a 4" pot or tray of pre-moistened sawdust/sand mixture or just good old potting soil that has been
prepared for planting seedlings, with Pre-Plant and Weekly Feed
mixes included at 1 1/2 ounces and 3/4 ounces per 1/2 cubic foot of
soil.

Water regularly to maintain soil moisture with clean water, until
roots appear, then use the constant feed solution of 1 ounce Weekly
Feed for 3 gallons of water for every watering until plants are
placed in the garden - about 4-6 weeks, depending on your growing
conditions.

Apply Pre-Plant and Weekly Feed to the soil before transplanting
into the garden. Feed weekly with Weekly Feed until 8 weeks before
harvest.

This simple process changes the time needed to grow mature
pineapples from 18+ months to 8 months! Sweet potatoes' growing
times can be reduced from 10 1/2 months to 7 months, and other crops
see similar improvement.

With those numbers, I hope some of you - especially in the warmer
climates - will have the courage to try your hand at propagating
plants. It can be both fun and rewarding.

Just remember that these plants are grown in the tropics for a
reason, and make sure they have ample heat and sunlight, along with
plenty of water.

And don't forget to eat the pinapple!! :-)

Below is a link that illustrates the process.

Good luck.

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Here is a link that might be useful: Propagation of the Pineapple