Finding the Fourth Proportional to 257,648.70, 386,499.56 and 89,168.73

Step by Step Solution

1. Step 1: Write the proportion equation
   257,648.70 : 386,499.56 = 89,168.73 : x
2. Step 2: Convert to fraction form
   257,648.70/386,499.56 = 89,168.73/x
3. Step 3: Cross multiply
   257,648.70x = 386,499.56 × 89,168.73
4. Step 4: Simplify right side
   257,648.70x = 34,463,672,532.42
5. Step 5: Solve for x
   x = 34,463,672,532.42/257,648.70
6. Step 6: Final answer
   x = 133,762.26