Finding the Fourth Proportional to 2,640.58, 3,643.39 and 1,578.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.58 : 3,643.39 = 1,578.69 : x
2. Step 2: Convert to fraction form
   2,640.58/3,643.39 = 1,578.69/x
3. Step 3: Cross multiply
   2,640.58x = 3,643.39 × 1,578.69
4. Step 4: Simplify right side
   2,640.58x = 5,751,775.47
5. Step 5: Solve for x
   x = 5,751,775.47/2,640.58
6. Step 6: Final answer
   x = 2,178.22