Finding the Fourth Proportional to 2,640.52, 3,643.86 and 1,521.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.52 : 3,643.86 = 1,521.39 : x
2. Step 2: Convert to fraction form
   2,640.52/3,643.86 = 1,521.39/x
3. Step 3: Cross multiply
   2,640.52x = 3,643.86 × 1,521.39
4. Step 4: Simplify right side
   2,640.52x = 5,543,729.32
5. Step 5: Solve for x
   x = 5,543,729.32/2,640.52
6. Step 6: Final answer
   x = 2,099.49