Let's dive into this subtraction. We'll start with 94202784 and subtract 90646169 from it.

Step 1: We'll start by subtracting the digit 9 and the borrow 0 from 4 in column 1 and get -5.
We add -5 to 10 and get 5 as the first digit of the result.

Step 2: We'll start by subtracting the digit 6 and the borrow 1 from 8 in column 2 and get 1.
1 is the next digit of our result.

Step 3: We'll start by subtracting the digit 1 and the borrow 0 from 7 in column 3 and get 6.
6 is the next digit of our result.

Step 4: We'll start by subtracting the digit 6 and the borrow 0 from 2 in column 4 and get -4.
We add -4 to 10 and get 6 as the next digit of the result.

Step 5: We'll start by subtracting the digit 4 and the borrow 1 from 0 in column 5 and get -5.
We add -5 to 10 and get 5 as the next digit of the result.

Step 6: We'll start by subtracting the digit 6 and the borrow 1 from 2 in column 6 and get -5.
We add -5 to 10 and get 5 as the next digit of the result.

Step 7: We'll start by subtracting the digit 0 and the borrow 1 from 4 in column 7 and get 3.
3 is the next digit of our result.

Step 8: We'll start by subtracting the digit 9 and the borrow 0 from 9 in column 8 and get 0.
0 is the next digit of our result.

So, 94202784 - 90646169 = 3556615.