Finding the Fourth Proportional to 1,020.33, 1,531.04 and 581.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.33 : 1,531.04 = 581.31 : x
2. Step 2: Convert to fraction form
   1,020.33/1,531.04 = 581.31/x
3. Step 3: Cross multiply
   1,020.33x = 1,531.04 × 581.31
4. Step 4: Simplify right side
   1,020.33x = 890,005.96
5. Step 5: Solve for x
   x = 890,005.96/1,020.33
6. Step 6: Final answer
   x = 872.27