Finding the Fourth Proportional to 2,640.24, 3,643.56 and 1,521

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.24 : 3,643.56 = 1,521 : x
2. Step 2: Convert to fraction form
   2,640.24/3,643.56 = 1,521/x
3. Step 3: Cross multiply
   2,640.24x = 3,643.56 × 1,521
4. Step 4: Simplify right side
   2,640.24x = 5,541,854.76
5. Step 5: Solve for x
   x = 5,541,854.76/2,640.24
6. Step 6: Final answer
   x = 2,099.00