Finding the Fourth Proportional to 10,965.76, 15,114.98 and 8,571.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,965.76 : 15,114.98 = 8,571.50 : x
2. Step 2: Convert to fraction form
   10,965.76/15,114.98 = 8,571.50/x
3. Step 3: Cross multiply
   10,965.76x = 15,114.98 × 8,571.50
4. Step 4: Simplify right side
   10,965.76x = 129,558,114.52
5. Step 5: Solve for x
   x = 129,558,114.52/10,965.76
6. Step 6: Final answer
   x = 11,814.78