Finding the Fourth Proportional to 2,640.15, 3,643.39 and 1,520.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.15 : 3,643.39 = 1,520.68 : x
2. Step 2: Convert to fraction form
   2,640.15/3,643.39 = 1,520.68/x
3. Step 3: Cross multiply
   2,640.15x = 3,643.39 × 1,520.68
4. Step 4: Simplify right side
   2,640.15x = 5,540,430.31
5. Step 5: Solve for x
   x = 5,540,430.31/2,640.15
6. Step 6: Final answer
   x = 2,098.53