Finding the Fourth Proportional to 17,142.72, 23,657.76 and 9,689.28

Step by Step Solution

1. Step 1: Write the proportion equation
   17,142.72 : 23,657.76 = 9,689.28 : x
2. Step 2: Convert to fraction form
   17,142.72/23,657.76 = 9,689.28/x
3. Step 3: Cross multiply
   17,142.72x = 23,657.76 × 9,689.28
4. Step 4: Simplify right side
   17,142.72x = 229,226,660.81
5. Step 5: Solve for x
   x = 229,226,660.81/17,142.72
6. Step 6: Final answer
   x = 13,371.66