Hello, yes, you can "daisychain" a second AP off a spare Eth port (depending on model),
that should theoretically be able to extend 100m in length (CAT5e/CAT6). I have personally
tested PoE out for 277 feet (the max length of a spool of cable from Fry's Electronics) too,
but using a power supply or PoE injector on the extended AP(s) is recommended/preferred.
You ought to be able to daisychain 2 additional APs in this fashion ok. (assuming <100
clients each, not all Guest Access or HotSpot, etc)