Finding the Fourth Proportional to 2,078.69, 2,859.99 and 1,578.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.69 : 2,859.99 = 1,578.43 : x
2. Step 2: Convert to fraction form
   2,078.69/2,859.99 = 1,578.43/x
3. Step 3: Cross multiply
   2,078.69x = 2,859.99 × 1,578.43
4. Step 4: Simplify right side
   2,078.69x = 4,514,279.72
5. Step 5: Solve for x
   x = 4,514,279.72/2,078.69
6. Step 6: Final answer
   x = 2,171.69