it is the person coming out of the parking space
In most cases parking lots are private property and are not subject to street laws. Therefore, no insurance company will assume liability.
Its the person that hit the car coming in to the parking lot because probably the bad car was speeding. :)
The person who ran into you from behind of course because they should be stopping, or slowing down when you turn in the parking lot.
the person pulling out
The person backing out.
The person backing out due to the other car having the right-of-way.
that person who hit you
Answering "Pulling out of a parking lot onto a street and you have to back up to avoid on coming car and the car behind you hits you who is at fault?"
The greater fault lies with the person backing out of the parking space. You may still be partially at fault for not driving with due care.
Its logical.........the person who backed out while the other person was at it!
person coming from behind