Finding the Fourth Proportional to 139,151.30, 192,049.42 and 88,168.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,151.30 : 192,049.42 = 88,168.78 : x
2. Step 2: Convert to fraction form
   139,151.30/192,049.42 = 88,168.78/x
3. Step 3: Cross multiply
   139,151.30x = 192,049.42 × 88,168.78
4. Step 4: Simplify right side
   139,151.30x = 16,932,762,581.94
5. Step 5: Solve for x
   x = 16,932,762,581.94/139,151.30
6. Step 6: Final answer
   x = 121,685.98