Finding the Fourth Proportional to 1,022.80, 1,411.24 and 580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.80 : 1,411.24 = 580.72 : x
2. Step 2: Convert to fraction form
   1,022.80/1,411.24 = 580.72/x
3. Step 3: Cross multiply
   1,022.80x = 1,411.24 × 580.72
4. Step 4: Simplify right side
   1,022.80x = 819,535.29
5. Step 5: Solve for x
   x = 819,535.29/1,022.80
6. Step 6: Final answer
   x = 801.27