Help me figure out this balloon mortgage...

If you are not including taxes and insurance your monthly payment on principal and interest for a 60 month term at 3% interest on a loan amount of $369,000 would be $6,630.45. That is as close as you can get to what you are askign for and would leave you with a ballon payment of $6,630.45 on the last month of the term.

The answer is $585.70. I do this all the time with amortization schedules I create in Excel. For a loan of $36,900, with a rate of 3.0%, at the end of 60 months, there will be a $5,000 balance. Hope that helps.

If you meant to ask for a loan of $369,000, the answer is $6,553.10. That leaves a balance of exactly $5,000 after 60 months.

I'm not sure if I understand the question. If your final payment is $5,000 and you somehow know the interest rate at which that can be refinanced then you would also need to know the term over which the $5000 will be paid. I suspect that you really need to refinance the $5000 balloon. To answer that you'll simply need to find a personal loan for $5000 from your bank or credit union and have then calculate the payment for you.