Finding the Fourth Proportional to 8,057.12, 12,086.78 and 7,571.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,057.12 : 12,086.78 = 7,571.12 : x
2. Step 2: Convert to fraction form
   8,057.12/12,086.78 = 7,571.12/x
3. Step 3: Cross multiply
   8,057.12x = 12,086.78 × 7,571.12
4. Step 4: Simplify right side
   8,057.12x = 91,510,461.79
5. Step 5: Solve for x
   x = 91,510,461.79/8,057.12
6. Step 6: Final answer
   x = 11,357.71