Finding the Fourth Proportional to 139,481.27, 192,493.10 and 78,233.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,481.27 : 192,493.10 = 78,233.21 : x
2. Step 2: Convert to fraction form
   139,481.27/192,493.10 = 78,233.21/x
3. Step 3: Cross multiply
   139,481.27x = 192,493.10 × 78,233.21
4. Step 4: Simplify right side
   139,481.27x = 15,059,352,724.69
5. Step 5: Solve for x
   x = 15,059,352,724.69/139,481.27
6. Step 6: Final answer
   x = 107,966.85