Finding the Fourth Proportional to 12,642.57, 17,443.71 and 8,165.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.57 : 17,443.71 = 8,165.43 : x
2. Step 2: Convert to fraction form
   12,642.57/17,443.71 = 8,165.43/x
3. Step 3: Cross multiply
   12,642.57x = 17,443.71 × 8,165.43
4. Step 4: Simplify right side
   12,642.57x = 142,435,392.95
5. Step 5: Solve for x
   x = 142,435,392.95/12,642.57
6. Step 6: Final answer
   x = 11,266.33