Finding the Fourth Proportional to 257,772.48, 386,565.72 and 89,247.12

Step by Step Solution

1. Step 1: Write the proportion equation
   257,772.48 : 386,565.72 = 89,247.12 : x
2. Step 2: Convert to fraction form
   257,772.48/386,565.72 = 89,247.12/x
3. Step 3: Cross multiply
   257,772.48x = 386,565.72 × 89,247.12
4. Step 4: Simplify right side
   257,772.48x = 34,499,877,200.73
5. Step 5: Solve for x
   x = 34,499,877,200.73/257,772.48
6. Step 6: Final answer
   x = 133,838.48