Finding the Fourth Proportional to 3,947.28, 5,443.40 and 3,660.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.28 : 5,443.40 = 3,660.96 : x
2. Step 2: Convert to fraction form
   3,947.28/5,443.40 = 3,660.96/x
3. Step 3: Cross multiply
   3,947.28x = 5,443.40 × 3,660.96
4. Step 4: Simplify right side
   3,947.28x = 19,928,069.66
5. Step 5: Solve for x
   x = 19,928,069.66/3,947.28
6. Step 6: Final answer
   x = 5,048.56