Finding the Fourth Proportional to 318,890,802.71, 440,069,304.09 and 172,213,086.71

Step by Step Solution

1. Step 1: Write the proportion equation
   318,890,802.71 : 440,069,304.09 = 172,213,086.71 : x
2. Step 2: Convert to fraction form
   318,890,802.71/440,069,304.09 = 172,213,086.71/x
3. Step 3: Cross multiply
   318,890,802.71x = 440,069,304.09 × 172,213,086.71
4. Step 4: Simplify right side
   318,890,802.71x = 75,785,693,222,799,456
5. Step 5: Solve for x
   x = 75,785,693,222,799,456/318,890,802.71
6. Step 6: Final answer
   x = 237,654,057.69