Finding the Fourth Proportional to 2,640.39, 3,640.29 and 1,643.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.39 : 3,640.29 = 1,643.94 : x
2. Step 2: Convert to fraction form
   2,640.39/3,640.29 = 1,643.94/x
3. Step 3: Cross multiply
   2,640.39x = 3,640.29 × 1,643.94
4. Step 4: Simplify right side
   2,640.39x = 5,984,418.34
5. Step 5: Solve for x
   x = 5,984,418.34/2,640.39
6. Step 6: Final answer
   x = 2,266.49