Finding the Fourth Proportional to 2,863.81, 3,956.34 and 2,728.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,863.81 : 3,956.34 = 2,728.81 : x
2. Step 2: Convert to fraction form
   2,863.81/3,956.34 = 2,728.81/x
3. Step 3: Cross multiply
   2,863.81x = 3,956.34 × 2,728.81
4. Step 4: Simplify right side
   2,863.81x = 10,796,100.16
5. Step 5: Solve for x
   x = 10,796,100.16/2,863.81
6. Step 6: Final answer
   x = 3,769.84