Finding the Fourth Proportional to 2,640.54, 3,956.70 and 1,339.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.54 : 3,956.70 = 1,339.68 : x
2. Step 2: Convert to fraction form
   2,640.54/3,956.70 = 1,339.68/x
3. Step 3: Cross multiply
   2,640.54x = 3,956.70 × 1,339.68
4. Step 4: Simplify right side
   2,640.54x = 5,300,711.86
5. Step 5: Solve for x
   x = 5,300,711.86/2,640.54
6. Step 6: Final answer
   x = 2,007.43