I need help completing a pre-wired four way light circuit. Three switch boxes, power comes into the middle box, and the wire to the lights also comes into the middle box, the two switch boxes on the ends are connected to the middel switchbox via three-wire. Is it possible to complete this without running any new wires>??

Please help!

If it has red, white, and black(12-3) you can.
At each 3 way switch, identify white wires with black tape. This and the black will be travellers on each 3 way switch, connect the red to the dark(common) screw.
Then at the center box(4 way location), identify whites that go to the 2 3 ways with black tape. Now you have 2 blacks from each 3way, those 4 wires connect to the 4 way switch.
Connect neutral in, to lights neutral.
Then Constant power to one red wire/either one, then connect the wire that is the lights hot, to the other red.