Finding the Fourth Proportional to 2,640.06, 3,643.45 and 1,521.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.06 : 3,643.45 = 1,521.15 : x
2. Step 2: Convert to fraction form
   2,640.06/3,643.45 = 1,521.15/x
3. Step 3: Cross multiply
   2,640.06x = 3,643.45 × 1,521.15
4. Step 4: Simplify right side
   2,640.06x = 5,542,216.50
5. Step 5: Solve for x
   x = 5,542,216.50/2,640.06
6. Step 6: Final answer
   x = 2,099.28