Finding the Fourth Proportional to 3,969.71, 5,478.17 and 2,201.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.71 : 5,478.17 = 2,201.31 : x
2. Step 2: Convert to fraction form
   3,969.71/5,478.17 = 2,201.31/x
3. Step 3: Cross multiply
   3,969.71x = 5,478.17 × 2,201.31
4. Step 4: Simplify right side
   3,969.71x = 12,059,139.40
5. Step 5: Solve for x
   x = 12,059,139.40/3,969.71
6. Step 6: Final answer
   x = 3,037.79