I want to calculate EV of 4b prf. I am confused on the calculation because there is still money behind if I 4b pot and the pot is multi-way.

PokerStars Hand #2906343532: Omaha Pot Limit ($0.05/$0.10) - 2014/08/13 1:01:49

Table '#8772444' 6-max Seat #6 is the button

Seat 1: Small Blind ($6.18 in chips)

Seat 2: Big Blind ($10.74 in chips)

Seat 3: Hero ($10.15 in chips)

Seat 4: UTGplus1 ($3.60 in chips)

Seat 5: UTGplus2 ($16.10 in chips)

Seat 6: Dealer ($2.85 in chips)

Small Blind: posts small blind $0.05

Big Blind: posts big blind $0.10

*** HOLE CARDS ***

Dealt to Hero [5d Ks Kh Ad]

Hero: raises $0.35 to $0.35

UTGplus1: folds

UTGplus2: raises $1.20 to $1.20

Dealer: folds

Small Blind: calls $1.15

Big Blind: folds

Hero: raises $4.55 to $4.90

I understand basic formula for EV as sum of all associated probabilties with relative outcomes minus cost (total?) but I am having trouble appling in this hand.

My basic assumptions: 

sb (fish) always folds if I 4b

villain 3b range is 8%(oo), never flats for 50% effective stacks (iffy?), and GII 4%

Any help would be much appreciated. Also, I realize this could get more complicated if villain can flat, but if someone could show, just generally, how that calculation would go that would be awesome. TyTy