PC to TV with VGA and audio cable - NO sound?

Hello,

I am having trouble getting audio on my TV (a Westinghouse VR-2218) when I hook it up to my PC (Dell Latitude E6500; Windows XP). I am using a VGA cable and a 2 RCA to 3.5mm stereo cable. I have attempted to change audio settings on my TV and on my laptop with no luck. The VGA/video works fine, I just can't get sound. I have tried using a double male stereo cable, which HAS produced sound, but it is incredibly soft and hard to hear. The user manual for my TV is here: http://westinghousedigital.com/wordpress/wp-content/uploads/2011/05/VR2218_User_Manual.pdf
Page 6 makes it seem like I can only hook up sound with VGA through the "PC in" input, with a double male cable.... could this be the case?
Any assistance would be appreciated!

Thanks!