Finding the Fourth Proportional to 257,571.78, 386,416.56 and 89,091.96

Step by Step Solution

1. Step 1: Write the proportion equation
   257,571.78 : 386,416.56 = 89,091.96 : x
2. Step 2: Convert to fraction form
   257,571.78/386,416.56 = 89,091.96/x
3. Step 3: Cross multiply
   257,571.78x = 386,416.56 × 89,091.96
4. Step 4: Simplify right side
   257,571.78x = 34,426,608,706.86
5. Step 5: Solve for x
   x = 34,426,608,706.86/257,571.78
6. Step 6: Final answer
   x = 133,658.31