my guess would be you need to get some speakers for it.. either a stereo, wich would be easyest since you can connect the left and right channel directly too it. or using a set of pc speakers, in wich case you'd have to be creative with adapters to connect it.
Well, what are the input connections on the projector? Does it have built in speakers?
What you could do is plug the RGB cables into the projector and run the red and white RCA cables through a converter like this
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RCA to Female Headphone Converter
And then just hook it up to a computer speaker system. Although I don't know how much luck you'll have finding this converter. It took me forever to find this picture. If you have a speaker system with the RCA inputs you could probably get extension cables for the audio cables and run them to the speakers.
EDIT:
Nevermind I just found some
http://www.amazon.com/Male-3-5mm-Stereo-Female-Y-Cable/dp/B000I23TTE/ref=dp_cp_ob_e_title_3
http://www.vpi.us/cable-audio.html
the xbox comes with a standars component cables (the green, red and blue ones) for video images, and 2 (red and white) connectrs for stereo sound. you could use this cables to connect the xbox to the beamer, and use the 2 acuto plugs to go to some speakers.
however, you could also use the optical out (assuming that xbox has it too. mine does, but I'm using the standar cable, not HDMI) to get the 5.1 sound of out it. (aka, connect a optical cable between the stereo and the xbox.)