Finding the Fourth Proportional to 17,061.28, 25,553.52 and 12,686.24

Step by Step Solution

1. Step 1: Write the proportion equation
   17,061.28 : 25,553.52 = 12,686.24 : x
2. Step 2: Convert to fraction form
   17,061.28/25,553.52 = 12,686.24/x
3. Step 3: Cross multiply
   17,061.28x = 25,553.52 × 12,686.24
4. Step 4: Simplify right side
   17,061.28x = 324,178,087.56
5. Step 5: Solve for x
   x = 324,178,087.56/17,061.28
6. Step 6: Final answer
   x = 19,000.81