Finding the Fourth Proportional to 102,456.50, 141,390.58 and 57,137.34

Step by Step Solution

1. Step 1: Write the proportion equation
   102,456.50 : 141,390.58 = 57,137.34 : x
2. Step 2: Convert to fraction form
   102,456.50/141,390.58 = 57,137.34/x
3. Step 3: Cross multiply
   102,456.50x = 141,390.58 × 57,137.34
4. Step 4: Simplify right side
   102,456.50x = 8,078,681,838.52
5. Step 5: Solve for x
   x = 8,078,681,838.52/102,456.50
6. Step 6: Final answer
   x = 78,849.87