First time poster
(converter won't work for BODOG NL tourney)
$10,000 Guaranteed NL $20 buy in

8 players seated
BB (3,800.00)
UTG (6,715.00)
UTG+1 (6,120.00)
MP1 (2,175.00)
HERO (2,785.00)
MP3 (9,880.00)
Button (4,921.00)
SB (2,233.00)

seat 4-UTG +1
KK
start chip amount $6,120.00
raised to $900

seat 6 (HERO)
J J
start chip amount $2,785.00

Blinds 100-200

-10k tourney 125 of 389 players remaining top 36 paid
-chip leader in tourney about 13,000 chips
-average stack in tourney about 5,000
-seat 4 just above average stack $6,120 (UTG +1) has been stealing blinds playing fairly aggressive raises action to 900 with KK
-I am in seat 6 with pocket JJ and can not decide whether to push all in or fold to raise
-he is betting 4.5 times bb from early position, I put him on mid PP or AK

Do I push all-in thinking I am either going to take him off small pair or have a coin flip or just fold??

Was this appropriate bet by him?