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PR(A) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/C(tn))
While we are not certain if this formula is still the one used by Google, it is probably at least very similar.
In the formula, PR(A) is the PageRank of the page = (1- d) where d is a "damping factor considered to be about 0.85 + d(PR(t1) where t1 is the PR of the incoming link page + ...+ PR (tn) is the Page Rank of all of the linking pages. Each page is divided by C which is the number of outgoing links from each page.
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