Finding the Fourth Proportional to 21,617.72, 32,408.10 and 8,300.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,617.72 : 32,408.10 = 8,300.28 : x
2. Step 2: Convert to fraction form
   21,617.72/32,408.10 = 8,300.28/x
3. Step 3: Cross multiply
   21,617.72x = 32,408.10 × 8,300.28
4. Step 4: Simplify right side
   21,617.72x = 268,996,304.27
5. Step 5: Solve for x
   x = 268,996,304.27/21,617.72
6. Step 6: Final answer
   x = 12,443.32