Finding the Fourth Proportional to 139,225.24, 192,139.59 and 78,772.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,225.24 : 192,139.59 = 78,772.87 : x
2. Step 2: Convert to fraction form
   139,225.24/192,139.59 = 78,772.87/x
3. Step 3: Cross multiply
   139,225.24x = 192,139.59 × 78,772.87
4. Step 4: Simplify right side
   139,225.24x = 15,135,386,944.92
5. Step 5: Solve for x
   x = 15,135,386,944.92/139,225.24
6. Step 6: Final answer
   x = 108,711.52