Finding the Fourth Proportional to 10,636.76, 14,687.34 and 9,515.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,636.76 : 14,687.34 = 9,515.72 : x
2. Step 2: Convert to fraction form
   10,636.76/14,687.34 = 9,515.72/x
3. Step 3: Cross multiply
   10,636.76x = 14,687.34 × 9,515.72
4. Step 4: Simplify right side
   10,636.76x = 139,760,614.98
5. Step 5: Solve for x
   x = 139,760,614.98/10,636.76
6. Step 6: Final answer
   x = 13,139.40