Remote access Ethernet x GPRS

I have an application where i need estabilish an remote connection with an industrial PC. In hhis PC i have access only to an ethernet port with VNC Server(listen). I have an GPRS connection thru SIM340 module. How can i interface this module with xPort by serial to estabilish my web connection into remote PC.

Remote PC (VNC Server) <–*1–> xPort <–*2–> GPRS Modem <—> Web <—> Local PC(VNC Viewer).
*1 = Ethernet
*2 = Serial

Regards. (sorry about my english :-/)