Finding the Fourth Proportional to 13,239.90, 18,271.18 and 7,271.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,239.90 : 18,271.18 = 7,271.69 : x
2. Step 2: Convert to fraction form
   13,239.90/18,271.18 = 7,271.69/x
3. Step 3: Cross multiply
   13,239.90x = 18,271.18 × 7,271.69
4. Step 4: Simplify right side
   13,239.90x = 132,862,356.89
5. Step 5: Solve for x
   x = 132,862,356.89/13,239.90
6. Step 6: Final answer
   x = 10,035.00