Finding the Fourth Proportional to 1,014.29, 1,399.54 and 572.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.29 : 1,399.54 = 572.21 : x
2. Step 2: Convert to fraction form
   1,014.29/1,399.54 = 572.21/x
3. Step 3: Cross multiply
   1,014.29x = 1,399.54 × 572.21
4. Step 4: Simplify right side
   1,014.29x = 800,830.78
5. Step 5: Solve for x
   x = 800,830.78/1,014.29
6. Step 6: Final answer
   x = 789.55