Finding the Fourth Proportional to 639,013,900,667.40, 881,866,902,883.56 and 353,872,420,763.31

Step by Step Solution

1. Step 1: Write the proportion equation
   639,013,900,667.40 : 881,866,902,883.56 = 353,872,420,763.31 : x
2. Step 2: Convert to fraction form
   639,013,900,667.40/881,866,902,883.56 = 353,872,420,763.31/x
3. Step 3: Cross multiply
   639,013,900,667.40x = 881,866,902,883.56 × 353,872,420,763.31
4. Step 4: Simplify right side
   639,013,900,667.40x = 312,068,375,714,448,208,297,984
5. Step 5: Solve for x
   x = 312,068,375,714,448,208,297,984/639,013,900,667.40
6. Step 6: Final answer
   x = 488,359,291,383.99