Finding the Fourth Proportional to 139,174.98, 192,061.44 and 78,744.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,174.98 : 192,061.44 = 78,744.42 : x
2. Step 2: Convert to fraction form
   139,174.98/192,061.44 = 78,744.42/x
3. Step 3: Cross multiply
   139,174.98x = 192,061.44 × 78,744.42
4. Step 4: Simplify right side
   139,174.98x = 15,123,766,697.16
5. Step 5: Solve for x
   x = 15,123,766,697.16/139,174.98
6. Step 6: Final answer
   x = 108,667.28