Finding the Fourth Proportional to 1,020.98, 1,531.47 and 443.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.98 : 1,531.47 = 443.86 : x
2. Step 2: Convert to fraction form
   1,020.98/1,531.47 = 443.86/x
3. Step 3: Cross multiply
   1,020.98x = 1,531.47 × 443.86
4. Step 4: Simplify right side
   1,020.98x = 679,758.27
5. Step 5: Solve for x
   x = 679,758.27/1,020.98
6. Step 6: Final answer
   x = 665.79