Finding the Fourth Proportional to 17,165.86, 23,689.27 and 12,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   17,165.86 : 23,689.27 = 12,139.10 : x
2. Step 2: Convert to fraction form
   17,165.86/23,689.27 = 12,139.10/x
3. Step 3: Cross multiply
   17,165.86x = 23,689.27 × 12,139.10
4. Step 4: Simplify right side
   17,165.86x = 287,566,491.85
5. Step 5: Solve for x
   x = 287,566,491.85/17,165.86
6. Step 6: Final answer
   x = 16,752.23