Finding the Fourth Proportional to 272,877.76, 408,560.88 and 139,470.72

Step by Step Solution

1. Step 1: Write the proportion equation
   272,877.76 : 408,560.88 = 139,470.72 : x
2. Step 2: Convert to fraction form
   272,877.76/408,560.88 = 139,470.72/x
3. Step 3: Cross multiply
   272,877.76x = 408,560.88 × 139,470.72
4. Step 4: Simplify right side
   272,877.76x = 56,982,280,097.43
5. Step 5: Solve for x
   x = 56,982,280,097.43/272,877.76
6. Step 6: Final answer
   x = 208,819.80