Finding the Fourth Proportional to 3,952.56, 5,928.72 and 2,221.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,952.56 : 5,928.72 = 2,221.20 : x
2. Step 2: Convert to fraction form
   3,952.56/5,928.72 = 2,221.20/x
3. Step 3: Cross multiply
   3,952.56x = 5,928.72 × 2,221.20
4. Step 4: Simplify right side
   3,952.56x = 13,168,872.86
5. Step 5: Solve for x
   x = 13,168,872.86/3,952.56
6. Step 6: Final answer
   x = 3,331.73