Finding the Fourth Proportional to 21,563.72, 29,757.86 and 12,132.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,563.72 : 29,757.86 = 12,132.28 : x
2. Step 2: Convert to fraction form
   21,563.72/29,757.86 = 12,132.28/x
3. Step 3: Cross multiply
   21,563.72x = 29,757.86 × 12,132.28
4. Step 4: Simplify right side
   21,563.72x = 361,030,540.93
5. Step 5: Solve for x
   x = 361,030,540.93/21,563.72
6. Step 6: Final answer
   x = 16,742.50