Finding the Fourth Proportional to 16,921.71, 25,406.46 and 10,661.42

Step by Step Solution

1. Step 1: Write the proportion equation
   16,921.71 : 25,406.46 = 10,661.42 : x
2. Step 2: Convert to fraction form
   16,921.71/25,406.46 = 10,661.42/x
3. Step 3: Cross multiply
   16,921.71x = 25,406.46 × 10,661.42
4. Step 4: Simplify right side
   16,921.71x = 270,869,004.29
5. Step 5: Solve for x
   x = 270,869,004.29/16,921.71
6. Step 6: Final answer
   x = 16,007.19