Finding the Fourth Proportional to 2,640.57, 3,643.71 and 1,521.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.57 : 3,643.71 = 1,521.29 : x
2. Step 2: Convert to fraction form
   2,640.57/3,643.71 = 1,521.29/x
3. Step 3: Cross multiply
   2,640.57x = 3,643.71 × 1,521.29
4. Step 4: Simplify right side
   2,640.57x = 5,543,121.37
5. Step 5: Solve for x
   x = 5,543,121.37/2,640.57
6. Step 6: Final answer
   x = 2,099.21