Finding the Fourth Proportional to 139,838.67, 192,978.68 and 79,410.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,838.67 : 192,978.68 = 79,410.56 : x
2. Step 2: Convert to fraction form
   139,838.67/192,978.68 = 79,410.56/x
3. Step 3: Cross multiply
   139,838.67x = 192,978.68 × 79,410.56
4. Step 4: Simplify right side
   139,838.67x = 15,324,543,684.91
5. Step 5: Solve for x
   x = 15,324,543,684.91/139,838.67
6. Step 6: Final answer
   x = 109,587.31