Finding the Fourth Proportional to 2,805.30, 3,868.56 and 1,686.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.30 : 3,868.56 = 1,686.42 : x
2. Step 2: Convert to fraction form
   2,805.30/3,868.56 = 1,686.42/x
3. Step 3: Cross multiply
   2,805.30x = 3,868.56 × 1,686.42
4. Step 4: Simplify right side
   2,805.30x = 6,524,016.96
5. Step 5: Solve for x
   x = 6,524,016.96/2,805.30
6. Step 6: Final answer
   x = 2,325.60