Finding the Fourth Proportional to 2,645.40, 3,960.81 and 1,340.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.40 : 3,960.81 = 1,340.49 : x
2. Step 2: Convert to fraction form
   2,645.40/3,960.81 = 1,340.49/x
3. Step 3: Cross multiply
   2,645.40x = 3,960.81 × 1,340.49
4. Step 4: Simplify right side
   2,645.40x = 5,309,426.20
5. Step 5: Solve for x
   x = 5,309,426.20/2,645.40
6. Step 6: Final answer
   x = 2,007.04