Finding the Fourth Proportional to 2,866.31, 3,956.82 and 2,086.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,866.31 : 3,956.82 = 2,086.28 : x
2. Step 2: Convert to fraction form
   2,866.31/3,956.82 = 2,086.28/x
3. Step 3: Cross multiply
   2,866.31x = 3,956.82 × 2,086.28
4. Step 4: Simplify right side
   2,866.31x = 8,255,034.43
5. Step 5: Solve for x
   x = 8,255,034.43/2,866.31
6. Step 6: Final answer
   x = 2,880.02