Finding the Fourth Proportional to 257,411.86, 386,169.22 and 88,938.34

Step by Step Solution

1. Step 1: Write the proportion equation
   257,411.86 : 386,169.22 = 88,938.34 : x
2. Step 2: Convert to fraction form
   257,411.86/386,169.22 = 88,938.34/x
3. Step 3: Cross multiply
   257,411.86x = 386,169.22 × 88,938.34
4. Step 4: Simplify right side
   257,411.86x = 34,345,249,385.89
5. Step 5: Solve for x
   x = 34,345,249,385.89/257,411.86
6. Step 6: Final answer
   x = 133,425.28