Finding the Fourth Proportional to 21,644.49, 32,442.15 and 9,156.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,644.49 : 32,442.15 = 9,156.72 : x
2. Step 2: Convert to fraction form
   21,644.49/32,442.15 = 9,156.72/x
3. Step 3: Cross multiply
   21,644.49x = 32,442.15 × 9,156.72
4. Step 4: Simplify right side
   21,644.49x = 297,063,683.75
5. Step 5: Solve for x
   x = 297,063,683.75/21,644.49
6. Step 6: Final answer
   x = 13,724.68