Unable to get internet access with Cisco 1751 router and Cable Modem

I have a home test network and here is the setup. Internet connection into the house via a timewarner cable modem. I have the cable modem connected to a Cisco 1751 WIC 1ENET interface. My Cisco 1720 switch is connected to the Fast Ethernet interface on the router. I have enabled dhcp on the WIC interface and its getting a 10.114.184.80 ip and can ping timewarners default gateway and dns servers. I configured the Fast Ethernet interface with 192.168.100.3/24 IP. From a work station connected to the 1720 switch I can ping both 192.168.100.3 and 10.114.184.80 interface, however I can not get to the internet from the workstation.

I know its a routing issue, what route shoud I use? any help is nice.