Finding the Fourth Proportional to 139,144.79, 192,019.85 and 78,714.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,144.79 : 192,019.85 = 78,714.15 : x
2. Step 2: Convert to fraction form
   139,144.79/192,019.85 = 78,714.15/x
3. Step 3: Cross multiply
   139,144.79x = 192,019.85 × 78,714.15
4. Step 4: Simplify right side
   139,144.79x = 15,114,678,882.31
5. Step 5: Solve for x
   x = 15,114,678,882.31/139,144.79
6. Step 6: Final answer
   x = 108,625.55