Finding the Fourth Proportional to 17,128.32, 25,666.56 and 12,724.56

Step by Step Solution

1. Step 1: Write the proportion equation
   17,128.32 : 25,666.56 = 12,724.56 : x
2. Step 2: Convert to fraction form
   17,128.32/25,666.56 = 12,724.56/x
3. Step 3: Cross multiply
   17,128.32x = 25,666.56 × 12,724.56
4. Step 4: Simplify right side
   17,128.32x = 326,595,682.71
5. Step 5: Solve for x
   x = 326,595,682.71/17,128.32
6. Step 6: Final answer
   x = 19,067.58