Question : Problem: Is it possible to connect 4 PCs on one Ethernet cable ?

I have one cable connected to a switch from one end and on the other end I have four PCs
so far I've connected 2 PCs on the same cable using 2 "female-RG"
I've used the "white-orange , orange , white-green and green" for the first pc , and the rest wires for the second pc
but still there is tow more PCs not connected to the network ..
I'm wondering if there is some way to connect the remaining PCs on the same cable ?!
if so then how ?!

Answer : Problem: Is it possible to connect 4 PCs on one Ethernet cable ?

Doing what he did would only work for two computers.

A Cat5, 5e, or 6 cable has 4 pairs, 8 wires.  Each pair can make a circuit.  It takes two circuits, minimum, to have Ethernet - one circuit for transmit, one for receive.  Therefore, pirating wires for multiple ethernet connections, the answer is that he can only run two machines on a standard Ethernet cable maximum.  He cannot run four, since he will be short two more circuits/4 more wires.

Palserv, in your situation, as I said, the answer is to connect a hub or switch on your device end and plug all your pc's/devices into it.