Finding the Fourth Proportional to 3,871.28, 5,806.83 and 949.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.28 : 5,806.83 = 949.57 : x
2. Step 2: Convert to fraction form
   3,871.28/5,806.83 = 949.57/x
3. Step 3: Cross multiply
   3,871.28x = 5,806.83 × 949.57
4. Step 4: Simplify right side
   3,871.28x = 5,513,991.56
5. Step 5: Solve for x
   x = 5,513,991.56/3,871.28
6. Step 6: Final answer
   x = 1,424.33