Finding the Fourth Proportional to 12,729.72, 17,563.42 and 8,253.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,729.72 : 17,563.42 = 8,253.66 : x
2. Step 2: Convert to fraction form
   12,729.72/17,563.42 = 8,253.66/x
3. Step 3: Cross multiply
   12,729.72x = 17,563.42 × 8,253.66
4. Step 4: Simplify right side
   12,729.72x = 144,962,388.67
5. Step 5: Solve for x
   x = 144,962,388.67/12,729.72
6. Step 6: Final answer
   x = 11,387.72