Finding the Fourth Proportional to 2,785.78, 4,158.41 and 2,659.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,785.78 : 4,158.41 = 2,659.42 : x
2. Step 2: Convert to fraction form
   2,785.78/4,158.41 = 2,659.42/x
3. Step 3: Cross multiply
   2,785.78x = 4,158.41 × 2,659.42
4. Step 4: Simplify right side
   2,785.78x = 11,058,958.72
5. Step 5: Solve for x
   x = 11,058,958.72/2,785.78
6. Step 6: Final answer
   x = 3,969.79