Finding the Fourth Proportional to 3,928.71, 5,867.49 and 3,520.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.71 : 5,867.49 = 3,520.47 : x
2. Step 2: Convert to fraction form
   3,928.71/5,867.49 = 3,520.47/x
3. Step 3: Cross multiply
   3,928.71x = 5,867.49 × 3,520.47
4. Step 4: Simplify right side
   3,928.71x = 20,656,322.52
5. Step 5: Solve for x
   x = 20,656,322.52/3,928.71
6. Step 6: Final answer
   x = 5,257.79