Finding the Fourth Proportional to 12,868.71, 17,756.66 and 7,564.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.71 : 17,756.66 = 7,564.56 : x
2. Step 2: Convert to fraction form
   12,868.71/17,756.66 = 7,564.56/x
3. Step 3: Cross multiply
   12,868.71x = 17,756.66 × 7,564.56
4. Step 4: Simplify right side
   12,868.71x = 134,321,282.15
5. Step 5: Solve for x
   x = 134,321,282.15/12,868.71
6. Step 6: Final answer
   x = 10,437.82