Finding the Fourth Proportional to 13,139.24, 18,132.17 and 7,171.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.24 : 18,132.17 = 7,171.02 : x
2. Step 2: Convert to fraction form
   13,139.24/18,132.17 = 7,171.02/x
3. Step 3: Cross multiply
   13,139.24x = 18,132.17 × 7,171.02
4. Step 4: Simplify right side
   13,139.24x = 130,026,117.86
5. Step 5: Solve for x
   x = 130,026,117.86/13,139.24
6. Step 6: Final answer
   x = 9,896.02