Finding the Fourth Proportional to 2,681.56, 4,020.72 and 949.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,681.56 : 4,020.72 = 949.78 : x
2. Step 2: Convert to fraction form
   2,681.56/4,020.72 = 949.78/x
3. Step 3: Cross multiply
   2,681.56x = 4,020.72 × 949.78
4. Step 4: Simplify right side
   2,681.56x = 3,818,799.44
5. Step 5: Solve for x
   x = 3,818,799.44/2,681.56
6. Step 6: Final answer
   x = 1,424.10