Finding the Fourth Proportional to 257,328.72, 386,021.60 and 88,829.96

Step by Step Solution

1. Step 1: Write the proportion equation
   257,328.72 : 386,021.60 = 88,829.96 : x
2. Step 2: Convert to fraction form
   257,328.72/386,021.60 = 88,829.96/x
3. Step 3: Cross multiply
   257,328.72x = 386,021.60 × 88,829.96
4. Step 4: Simplify right side
   257,328.72x = 34,290,280,912.88
5. Step 5: Solve for x
   x = 34,290,280,912.88/257,328.72
6. Step 6: Final answer
   x = 133,254.78