Finding the Fourth Proportional to 13,139.01, 18,132.32 and 7,171.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.01 : 18,132.32 = 7,171.07 : x
2. Step 2: Convert to fraction form
   13,139.01/18,132.32 = 7,171.07/x
3. Step 3: Cross multiply
   13,139.01x = 18,132.32 × 7,171.07
4. Step 4: Simplify right side
   13,139.01x = 130,028,063.25
5. Step 5: Solve for x
   x = 130,028,063.25/13,139.01
6. Step 6: Final answer
   x = 9,896.34