Finding the Fourth Proportional to 257,141.27, 385,737.29 and 88,639.42

Step by Step Solution

1. Step 1: Write the proportion equation
   257,141.27 : 385,737.29 = 88,639.42 : x
2. Step 2: Convert to fraction form
   257,141.27/385,737.29 = 88,639.42/x
3. Step 3: Cross multiply
   257,141.27x = 385,737.29 × 88,639.42
4. Step 4: Simplify right side
   257,141.27x = 34,191,527,396.89
5. Step 5: Solve for x
   x = 34,191,527,396.89/257,141.27
6. Step 6: Final answer
   x = 132,967.87