Divide Fields in pivot table by a number outside pivot table

[almst791]

In my pivot table I have months for columns and names in rows. Each name has a amount associated with it in a respected month. Outside of my pivot table I have number of work days in each month. I need to divide the values in the pivot table by these values for each month. Any simple way to do this? so for each column in my pivot divide it by an outside cell. Possible?