Based on the framework in the previous two problems, you have found that you need to have a total of $$1,599,339$ in savings at the time you retire, in $39$ years. You currently only have $$23,422$ saved up in your retirement accounts.

If you anticipate that your $80/20$ investment portfolio will return an average of $11\%$ per year, how much extra must you save every year to reach your goal? Assume that you'll be saving the extra amount by the end of each year.