Hi, my name is Felipe Lucas, Independent Advisor and Microsoft Windows user like you.
I'll be happy to help you.
Yes you can do it. You just select the monitor in the display settings in windows (right click the desktop > display settings) click the new monitor (3 in your case) and select "Duplicate desktop on 1 and 3" in the "Multiple displays" box, and it should ask you to confirm, and that's it!
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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Felipe Lucas
Independent Advisor