Finding the Fourth Proportional to 318,890,802.78, 440,069,304.17 and 172,213,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   318,890,802.78 : 440,069,304.17 = 172,213,086.78 : x
2. Step 2: Convert to fraction form
   318,890,802.78/440,069,304.17 = 172,213,086.78/x
3. Step 3: Cross multiply
   318,890,802.78x = 440,069,304.17 × 172,213,086.78
4. Step 4: Simplify right side
   318,890,802.78x = 75,785,693,267,022,704
5. Step 5: Solve for x
   x = 75,785,693,267,022,704/318,890,802.78
6. Step 6: Final answer
   x = 237,654,057.78