Finding the Fourth Proportional to 1,014.28, 1,399.72 and 572.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.28 : 1,399.72 = 572.18 : x
2. Step 2: Convert to fraction form
   1,014.28/1,399.72 = 572.18/x
3. Step 3: Cross multiply
   1,014.28x = 1,399.72 × 572.18
4. Step 4: Simplify right side
   1,014.28x = 800,891.79
5. Step 5: Solve for x
   x = 800,891.79/1,014.28
6. Step 6: Final answer
   x = 789.62