Finding the Fourth Proportional to 11,153.20, 16,732.56 and 7,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,153.20 : 16,732.56 = 7,872.72 : x
2. Step 2: Convert to fraction form
   11,153.20/16,732.56 = 7,872.72/x
3. Step 3: Cross multiply
   11,153.20x = 16,732.56 × 7,872.72
4. Step 4: Simplify right side
   11,153.20x = 131,730,759.76
5. Step 5: Solve for x
   x = 131,730,759.76/11,153.20
6. Step 6: Final answer
   x = 11,811.03