This page shows several variations of using three or more switches to control lights. In every circuit, you may omit any or all of the 4-way switches if you need fewer switches. Similary, you can add as many additional 4-way switches between the 3-ways as you like, just following the same arrangement.
Here is the simplest arrangement, with the light at one end:
Here is a circuit with the light between the switches.
Here is a circuit similar to the above, but in this case the circuit it fed from the panel to the light box.