Finding the Fourth Proportional to 2,640.27, 3,959.34 and 1,323.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.27 : 3,959.34 = 1,323.54 : x
2. Step 2: Convert to fraction form
   2,640.27/3,959.34 = 1,323.54/x
3. Step 3: Cross multiply
   2,640.27x = 3,959.34 × 1,323.54
4. Step 4: Simplify right side
   2,640.27x = 5,240,344.86
5. Step 5: Solve for x
   x = 5,240,344.86/2,640.27
6. Step 6: Final answer
   x = 1,984.78