So, the first thing that you have to do is figure out what fraction of the money Steven deposited in his checking account. If he deposited 1/3 into his savings account, you would subtract that fraction from the whole (1) to get 2/3.
Now, you know that Steven deposited 2/3 of $4285.68 into his checking account. You multiply these two things together, to find the total amount Steven deposited in his checking account.
2/3 * 4285.68 = 2857.12
Your final answer is that Steven deposited $2857.12 into his checking account.