Finding the Fourth Proportional to 9,071.28, 12,510.72 and 7,661.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,071.28 : 12,510.72 = 7,661.88 : x
2. Step 2: Convert to fraction form
   9,071.28/12,510.72 = 7,661.88/x
3. Step 3: Cross multiply
   9,071.28x = 12,510.72 × 7,661.88
4. Step 4: Simplify right side
   9,071.28x = 95,855,635.35
5. Step 5: Solve for x
   x = 95,855,635.35/9,071.28
6. Step 6: Final answer
   x = 10,566.94