Thanks for the opinions guys, especially tank with all the in depth probabilities.
I put my chips in (there didn't seem to be any difference between putting the last $6 in on the turn or river) thinking i had odds to call. i's hoping he had 2 pair or trip 4's or something. It turned out he had Ah

; not a hand i put him on as i didn't expect him to call the flop with just a gut shot. So it was worst case senario and i's on an %18 percent shot.
luckily the

fell on the river scooping me the pot.
Royal Flush is probably right about checking it on the turn, i's hoping for folds from from the other two but that was probably wishful thinking with both of the them paying for the turn.