Since everyone started the hand with the same chip count and the tournament pays 5 places, the total prize pool for places 2 through 5 should be combined and then divided equally among the 9 people eliminated in the hand. It doesn't matter whose hands were better than others among the losers of the hand. The only relevant fact is the chip counts at the start of the hand.
Just poking around, I see that Full Tilt's tournament rules page describes this situation in rule #24.
If two or more players are eliminated on the same hand, the player
with more chips at the beginning of the hand is placed higher. If
players started the hands with an identical amount of chips, both
players tie for that rank, and any prizes due to those players will be
equally distributed between them.