Finding the Fourth Proportional to 3,969.72, 5,478.16 and 2,201.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.72 : 5,478.16 = 2,201.32 : x
2. Step 2: Convert to fraction form
   3,969.72/5,478.16 = 2,201.32/x
3. Step 3: Cross multiply
   3,969.72x = 5,478.16 × 2,201.32
4. Step 4: Simplify right side
   3,969.72x = 12,059,183.17
5. Step 5: Solve for x
   x = 12,059,183.17/3,969.72
6. Step 6: Final answer
   x = 3,037.79