Finding the Fourth Proportional to 3,959.71, 5,464.38 and 2,191.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,959.71 : 5,464.38 = 2,191.31 : x
2. Step 2: Convert to fraction form
   3,959.71/5,464.38 = 2,191.31/x
3. Step 3: Cross multiply
   3,959.71x = 5,464.38 × 2,191.31
4. Step 4: Simplify right side
   3,959.71x = 11,974,150.54
5. Step 5: Solve for x
   x = 11,974,150.54/3,959.71
6. Step 6: Final answer
   x = 3,024.00