Find the third and fourth non-blank cells in a column and then enter each result in a cell

Hello All,
I have been on numerous websites all day but have not been successful in finding the answer to my problem.

Problem:
I need help to find the third and fourth non-blank cell in a range in, see attachment.
In range E12:E61, there are a series of blank and non-blank cells.
I need a formula to find the third non-blank cell, which in this example is M5-M5 and then enter the result, M5-M5, in cell E2
Similarly, I need a formula to find the fourth non-blank cell, which in this example is M7-M7 and then enter the result, M7-M7 in cell E4.
Now all the cells in range E12:E61 have formulas in them so the third and fourth non-blank cell could change depending on other conditions.

Any help would be appreciated.

Hello,
Fist thank you both for your response.

Tony, your formulas worked for both answer I was looking for so I went with it. Can you give me a brief explanation of your formula?

Richard, your formula was the most common format style that I found when I was searching the web for answers but none of them quite worked the way I needed them to. But yours did work for finding the
third non-blank cell. But when I changed the 3 to 4 for E4, the answer is blank, so it did not work for the fourth.
Do you have a fix for it?

Thanks,
Noel