Finding the Fourth Proportional to 139,208.41, 192,105.57 and 81,854.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,208.41 : 192,105.57 = 81,854.20 : x
2. Step 2: Convert to fraction form
   139,208.41/192,105.57 = 81,854.20/x
3. Step 3: Cross multiply
   139,208.41x = 192,105.57 × 81,854.20
4. Step 4: Simplify right side
   139,208.41x = 15,724,647,747.89
5. Step 5: Solve for x
   x = 15,724,647,747.89/139,208.41
6. Step 6: Final answer
   x = 112,957.60