Finding the Fourth Proportional to 16,685.39, 23,028.42 and 9,515.31

Step by Step Solution

1. Step 1: Write the proportion equation
   16,685.39 : 23,028.42 = 9,515.31 : x
2. Step 2: Convert to fraction form
   16,685.39/23,028.42 = 9,515.31/x
3. Step 3: Cross multiply
   16,685.39x = 23,028.42 × 9,515.31
4. Step 4: Simplify right side
   16,685.39x = 219,122,605.78
5. Step 5: Solve for x
   x = 219,122,605.78/16,685.39
6. Step 6: Final answer
   x = 13,132.61