[intx]

It's possible, I do it daily.


Hook an ethernet cord from your PC to your xbox.

Plug USB in to your pc, turn on internet sharing.

On vista or 7: Go to network and sharing center, then Change Adapter Settings(or Manage Network Connections)

Ctrl + Click your phone's usb connection and your Local Area Network you have hooked to your xbox.

Right click one of them, hit bridge connections(You may have to do this a few times, it's glitchy).

Turn on Xbox, there ya go.