Finding the Fourth Proportional to 139,337.49, 192,287.94 and 78,906.49

Step by Step Solution

1. Step 1: Write the proportion equation
   139,337.49 : 192,287.94 = 78,906.49 : x
2. Step 2: Convert to fraction form
   139,337.49/192,287.94 = 78,906.49/x
3. Step 3: Cross multiply
   139,337.49x = 192,287.94 × 78,906.49
4. Step 4: Simplify right side
   139,337.49x = 15,172,766,414.73
5. Step 5: Solve for x
   x = 15,172,766,414.73/139,337.49
6. Step 6: Final answer
   x = 108,892.20