Finding the Fourth Proportional to 139,129.98, 192,002.82 and 78,697.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,129.98 : 192,002.82 = 78,697.68 : x
2. Step 2: Convert to fraction form
   139,129.98/192,002.82 = 78,697.68/x
3. Step 3: Cross multiply
   139,129.98x = 192,002.82 × 78,697.68
4. Step 4: Simplify right side
   139,129.98x = 15,110,176,487.46
5. Step 5: Solve for x
   x = 15,110,176,487.46/139,129.98
6. Step 6: Final answer
   x = 108,604.75