Run a query for loop ordering by the sum of the inverse of comment age with WP_Query

I need some help creating a specific WordPress query and I am drawing a blank on how to do it.

I want to select n posts ordered by the sum of the inverse of the age in days of the comments. I'd like to use the WP_Query class if I can but I'm unsure how to proceed.

If I was doing raw SQL I'd do something like:

SELECT *, SUM(1/(DIF(table1.date,NOW()))) as score 
FROM table1 INNER JOIN table2 ON table1.id = table2.fk_id 
GROUP BY table1.id 
ORDER BY score
LIMIT 10;

This is how Facebook used to calculate the edgerank for posts. I want to do this for "trending posts". Obviousely, I then want to run a loop to output the posts.

Can I do that natively?