At the lights the hot source is spliced to the black wire at each fixture box, at the last fixture it is spliced to the black wire running to the common on SW1. The neutral from the source is connected to each light fixture with a pigtail and run on to the next light.
In order for a 4 way circuit to work, the 3 way switches must be wired properly at the the beginning and end of the path. So be sure that the common terminal on one of the 3 ways is wired to the hot source, and the common on the second 3 way is wired to the the hot terminal on the lights.
This diagram shows the wiring to control a receptacle outlet with two 3 way switches. The source is at SW1 and 3-wire cable runs between all the devices. The hot wire from the source connects to the common terminal on SW1. The common on SW2 is connected to the hot terminal on the receptacle. The traveler wires are spliced in the receptacle box to run to the traveler terminals on each switch. The white cable wire is used as a traveler to SW2 and marked hot with black tape.
In this circuit, two fixtures are shown but more can be added by duplicating the wiring arrangement between the lights for each one added. Here the source is at SW1 and 3-wire cable runs from there to L1. Two, 2-wire cables run between the fixtures, and 3-wire cable runs from the last one to SW2.
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