Is there a way to hook my computer speakers to my surround sound system?

OK, my computer speakers are inside my monitor. Meaning I don't have those pesky little sound stations that normally come with a computer. Is there a way to plug my monitor into my surround sound system? I want the music to be louder. Or is there a way to purchase a surround sound system for my computer? Thanks.
Update: The cord I use to get sound is hooked up to the back of my monitor.
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