Looping by weeks...by months

Hi,

I have an attached spreadsheet, which has months (January 2011 for example) and the weeks broken out by Thursdays. (1/6/2011, 1/13/2011) Under the months I have a number, what I need to do is find a way to loop through the months, while iterating (looping) by week. Divide that monthly number by 4.25 and have it appear under the week. So 6.12 (26/4.25) would appear for every week in January. I can't iterate simply by four as you can see some months have 5 weeks. I have been at this a while but can't get VBA to quite do it. Sorry if my description is not clear, if you look at the attachment I manually did what i would like to loop through. Thanks, and let me know f you need anything else.

Tom