You are negotiating to make a 7-year loan of $33954 to "ABC" Company. To repay you, "ABC" Company will pay the following amounts: $2,500 at the end of Year 1, $5,000 at the end of Year 2, $7,500 at the end of Year 3, and A fixed but currently unspecified cash flow, X, at the end of each year from Year 4 through Year 7. "ABC" Company is essentially riskless, so you are confident the payments will be made. You regard 8% as the appropriate interest rate on a 7-year loan. Based on the above-given information, what is the amount of cash flow that "ABC" Company must pay at the end of year 4?