Finding the Fourth Proportional to 10,721.72, 16,017.15 and 8,532.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,721.72 : 16,017.15 = 8,532.89 : x
2. Step 2: Convert to fraction form
   10,721.72/16,017.15 = 8,532.89/x
3. Step 3: Cross multiply
   10,721.72x = 16,017.15 × 8,532.89
4. Step 4: Simplify right side
   10,721.72x = 136,672,498.98
5. Step 5: Solve for x
   x = 136,672,498.98/10,721.72
6. Step 6: Final answer
   x = 12,747.26