Finding the Fourth Proportional to 2,636.57, 3,640.20 and 1,643.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.57 : 3,640.20 = 1,643.24 : x
2. Step 2: Convert to fraction form
   2,636.57/3,640.20 = 1,643.24/x
3. Step 3: Cross multiply
   2,636.57x = 3,640.20 × 1,643.24
4. Step 4: Simplify right side
   2,636.57x = 5,981,722.25
5. Step 5: Solve for x
   x = 5,981,722.25/2,636.57
6. Step 6: Final answer
   x = 2,268.75