Go here https://runsmartproject.com/calculator/ use the calculator for the recent races you've done and the vdot calculation will then give you when you click on EQUIVALENT , what you should be able to do in the 10K. The 5k and the 1/2 marathon will more accurately predict the 10k then the marathon time. This should give you a place to start. I am also assuming the vdot from those races is the vdot your training at.
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https://runsmartproject.com/calculator/
use the calculator for the recent races you've done and the vdot calculation will then give you when you click on EQUIVALENT , what you should be able to do in the 10K. The 5k and the 1/2 marathon will more accurately predict the 10k then the marathon time. This should give you a place to start. I am also assuming the vdot from those races is the vdot your training at.