NEED HELP ASAP. Finance. just need some help figuring out the correct answer.

You are asked to analyze the following scenario and determine its value. What it the most you would be willing to invest in this project if your required rate of return is 8%. (Assume cash flows occur at the end of each year). Cash flows Year 1-3: $250,000,000 Year 4: ($700,000,000) Year 5-10: $145,000,000 $817,651,378 $622,456,761 $658,458,045 $454,789,469