Finding the Fourth Proportional to 21,061.92, 31,565.52 and 8,567.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.92 : 31,565.52 = 8,567.40 : x
2. Step 2: Convert to fraction form
   21,061.92/31,565.52 = 8,567.40/x
3. Step 3: Cross multiply
   21,061.92x = 31,565.52 × 8,567.40
4. Step 4: Simplify right side
   21,061.92x = 270,434,436.05
5. Step 5: Solve for x
   x = 270,434,436.05/21,061.92
6. Step 6: Final answer
   x = 12,839.97