Finding the Fourth Proportional to 2,861.87, 3,969.57 and 2,786.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.87 : 3,969.57 = 2,786.00 : x
2. Step 2: Convert to fraction form
   2,861.87/3,969.57 = 2,786.00/x
3. Step 3: Cross multiply
   2,861.87x = 3,969.57 × 2,786.00
4. Step 4: Simplify right side
   2,861.87x = 11,059,202.17
5. Step 5: Solve for x
   x = 11,059,202.17/2,861.87
6. Step 6: Final answer
   x = 3,864.33