Facebook: How to count the total reach or total number of engaged users?

Dear community members,

I’m confused by Facebook insights. I’d like to calculate the total reach or total number of engaged users by month.
I’m looking at these colums:
28 Days Page Engaged Users
28 Days Total Reach

But the number changes everyday in these colums and I expected to have the end day of the month to have the highest number. But it’s not the case, it goes up and down, so I don’t understand what number should I take in consideration as “total” number by month.

Can somebody please help me out?
Thank you very much in advance!

Perhaps counting a total average for each month?

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