Your current annual living expenditures are $$77,624.$ You estimate that at retirement in $30$ years, you will need $78\%$ of that, in today's dollars. You anticipate that your tax rate in retirement will be $16\%.$

You estimate that you will receive annual social security benefits of $$28,575$ per year, and plan to keep your rental property that produces annual net income of $$10,255,$ both in today's dollars.

What is the inflation$-$adjusted shortfall in your retirement income, if you expect an average $2\mathrm{.}9\%$ annual inflation?

Figure out how much pre$-$tax income you need, subtract expected retirement income, then adjust for inflation.