Finding the Fourth Proportional to 2,568.80, 3,546.47 and 1,686.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.80 : 3,546.47 = 1,686.15 : x
2. Step 2: Convert to fraction form
   2,568.80/3,546.47 = 1,686.15/x
3. Step 3: Cross multiply
   2,568.80x = 3,546.47 × 1,686.15
4. Step 4: Simplify right side
   2,568.80x = 5,979,854.23
5. Step 5: Solve for x
   x = 5,979,854.23/2,568.80
6. Step 6: Final answer
   x = 2,327.88