Finding the Fourth Proportional to 2,640.42, 3,643.91 and 1,521.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.42 : 3,643.91 = 1,521.53 : x
2. Step 2: Convert to fraction form
   2,640.42/3,643.91 = 1,521.53/x
3. Step 3: Cross multiply
   2,640.42x = 3,643.91 × 1,521.53
4. Step 4: Simplify right side
   2,640.42x = 5,544,292.56
5. Step 5: Solve for x
   x = 5,544,292.56/2,640.42
6. Step 6: Final answer
   x = 2,099.78