Finding the Fourth Proportional to 15,644.18, 21,589.25 and 8,570.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,644.18 : 21,589.25 = 8,570.15 : x
2. Step 2: Convert to fraction form
   15,644.18/21,589.25 = 8,570.15/x
3. Step 3: Cross multiply
   15,644.18x = 21,589.25 × 8,570.15
4. Step 4: Simplify right side
   15,644.18x = 185,022,960.09
5. Step 5: Solve for x
   x = 185,022,960.09/15,644.18
6. Step 6: Final answer
   x = 11,826.96