Finding the Fourth Proportional to 5,105.28, 7,665.12 and 2,641.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,105.28 : 7,665.12 = 2,641.92 : x
2. Step 2: Convert to fraction form
   5,105.28/7,665.12 = 2,641.92/x
3. Step 3: Cross multiply
   5,105.28x = 7,665.12 × 2,641.92
4. Step 4: Simplify right side
   5,105.28x = 20,250,633.83
5. Step 5: Solve for x
   x = 20,250,633.83/5,105.28
6. Step 6: Final answer
   x = 3,966.61