Finding the Fourth Proportional to 139,260.70, 192,204.31 and 78,834.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,260.70 : 192,204.31 = 78,834.78 : x
2. Step 2: Convert to fraction form
   139,260.70/192,204.31 = 78,834.78/x
3. Step 3: Cross multiply
   139,260.70x = 192,204.31 × 78,834.78
4. Step 4: Simplify right side
   139,260.70x = 15,152,384,493.90
5. Step 5: Solve for x
   x = 15,152,384,493.90/139,260.70
6. Step 6: Final answer
   x = 108,805.89