Finding the Fourth Proportional to 639,013,900,643.72, 881,866,902,850.96 and 353,872,420,739.72

Step by Step Solution

1. Step 1: Write the proportion equation
   639,013,900,643.72 : 881,866,902,850.96 = 353,872,420,739.72 : x
2. Step 2: Convert to fraction form
   639,013,900,643.72/881,866,902,850.96 = 353,872,420,739.72/x
3. Step 3: Cross multiply
   639,013,900,643.72x = 881,866,902,850.96 × 353,872,420,739.72
4. Step 4: Simplify right side
   639,013,900,643.72x = 312,068,375,682,108,648,062,976
5. Step 5: Solve for x
   x = 312,068,375,682,108,648,062,976/639,013,900,643.72
6. Step 6: Final answer
   x = 488,359,291,351.48