Finding the Fourth Proportional to 139,645.78, 192,730.98 and 79,231.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,645.78 : 192,730.98 = 79,231.42 : x
2. Step 2: Convert to fraction form
   139,645.78/192,730.98 = 79,231.42/x
3. Step 3: Cross multiply
   139,645.78x = 192,730.98 × 79,231.42
4. Step 4: Simplify right side
   139,645.78x = 15,270,349,223.39
5. Step 5: Solve for x
   x = 15,270,349,223.39/139,645.78
6. Step 6: Final answer
   x = 109,350.60