Finding the Fourth Proportional to 139,155.48, 192,034.53 and 78,724.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,155.48 : 192,034.53 = 78,724.89 : x
2. Step 2: Convert to fraction form
   139,155.48/192,034.53 = 78,724.89/x
3. Step 3: Cross multiply
   139,155.48x = 192,034.53 × 78,724.89
4. Step 4: Simplify right side
   139,155.48x = 15,117,897,250.45
5. Step 5: Solve for x
   x = 15,117,897,250.45/139,155.48
6. Step 6: Final answer
   x = 108,640.33