For what purpose are you calculating monthly taxes?
If it’s to make monthly payments to your government, you can add the taxes directly as a line item in Airbnb using their Professional Tools, and just pay the monthly total of those taxes.
If it’s to report the gross earnings to the government, you can calculate that in your spreadsheet by adding a Gross Earnings column and reverse-calculating that figure from the total of the taxes collected from each guest.
I wouldn’t use payout information to derive anything, as if you did, you would have to add back in the Airbnb host fee and massage other potential figures such as refunds you gave guests outside of your cancellation policy. Instead, use a formula consisting of the base rent + fees (cleaning, extra person, etc.) as your gross income and multiply that times your tax rate to cross check the amount of taxes you have collected from the guest using Professional Tools.