Finding the Fourth Proportional to 12,818.71, 17,690.49 and 7,515.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.71 : 17,690.49 = 7,515.23 : x
2. Step 2: Convert to fraction form
   12,818.71/17,690.49 = 7,515.23/x
3. Step 3: Cross multiply
   12,818.71x = 17,690.49 × 7,515.23
4. Step 4: Simplify right side
   12,818.71x = 132,948,101.16
5. Step 5: Solve for x
   x = 132,948,101.16/12,818.71
6. Step 6: Final answer
   x = 10,371.41