Alright, let's solve this problem step by step. We have 5090 and 4304 and we're adding them together.

Step 1: We'll start by adding the digits 0 & 4 in column 1 and get 4.

Step 2: We'll start by adding the digits 9 & 0 in column 2 and get 9.

Step 3: We'll start by adding the digits 0 & 3 in column 3 and get 3.

Step 4: We'll start by adding the digits 5 & 4 in column 4 and get 9.

So, 5090 + 4304 = 9394.

