I'll try posting this again since I haven't gotten the answer about the math:
Would someone point out where the 0.0028 is calculated for the elite pool? Thanks!
Sorry mate... I missed your question.
Here is a concrete example to figure out how LiskElite payouts' work:
I hade roughly 3.9K Lisk in my forging account for about a week. Today I received my share (10.9 LSK) based on 3892 LSK.
10.9 LSK (reward) divided by 0.0028 (the coefficient) equal the balance I left in my forging account for a week.
To simplify you can also calculate it the other way around:
3892 X 0.0028 = 10.8976 LSK
The proof for Thomas:
https://explorer.lisk.io/tx/9013045835012655592 