Finding the Fourth Proportional to 99,658.80, 139,626 and 99,658.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,658.80 : 139,626 = 99,658.80 : x
2. Step 2: Convert to fraction form
   99,658.80/139,626 = 99,658.80/x
3. Step 3: Cross multiply
   99,658.80x = 139,626 × 99,658.80
4. Step 4: Simplify right side
   99,658.80x = 13,914,959,608.80
5. Step 5: Solve for x
   x = 13,914,959,608.80/99,658.80
6. Step 6: Final answer
   x = 139,626