I need to display my computer's HDMI output in 4 diferent screens?

I have a small computer with a VGA and an HDMI output. I am using the HDMI output to display onto a 42” Plasma TV. I want to run the same signal to 3 other monitors (not necessarily TV) that are located in different rooms of my business. The other monitors will be smaller than the Plasma TV. Is it possible to “split” the video signal and have it display properly on all 4 screens even if they are each different dimensions?