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I believe you are saying that you want to set the Radio Fields "Allow Other" as a Numeric Validation.
Unfortunately, I don't think this is currently possible with its current design that I know of to say the least bit unless you added it in manually outside of jotform into it's full source code possibly. But, there is a way around this problem if you take a standard Radio Field and use Conditional Logic to then display a Number or Textbox Field when the last option is chosen and that could be set to contain your Numeric Value Option.