Finding the Fourth Proportional to 13,139.24, 18,132.42 and 7,550.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.24 : 18,132.42 = 7,550.60 : x
2. Step 2: Convert to fraction form
   13,139.24/18,132.42 = 7,550.60/x
3. Step 3: Cross multiply
   13,139.24x = 18,132.42 × 7,550.60
4. Step 4: Simplify right side
   13,139.24x = 136,910,650.45
5. Step 5: Solve for x
   x = 136,910,650.45/13,139.24
6. Step 6: Final answer
   x = 10,419.98