Finding the Fourth Proportional to 2,828.56, 4,243.88 and 979.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,828.56 : 4,243.88 = 979.87 : x
2. Step 2: Convert to fraction form
   2,828.56/4,243.88 = 979.87/x
3. Step 3: Cross multiply
   2,828.56x = 4,243.88 × 979.87
4. Step 4: Simplify right side
   2,828.56x = 4,158,450.70
5. Step 5: Solve for x
   x = 4,158,450.70/2,828.56
6. Step 6: Final answer
   x = 1,470.17