Finding the Fourth Proportional to 139,222.96, 192,127.60 and 78,792.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,222.96 : 192,127.60 = 78,792.50 : x
2. Step 2: Convert to fraction form
   139,222.96/192,127.60 = 78,792.50/x
3. Step 3: Cross multiply
   139,222.96x = 192,127.60 × 78,792.50
4. Step 4: Simplify right side
   139,222.96x = 15,138,213,923
5. Step 5: Solve for x
   x = 15,138,213,923/139,222.96
6. Step 6: Final answer
   x = 108,733.60