Finding the Fourth Proportional to 1,020.69, 1,530.50 and 443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.69 : 1,530.50 = 443.25 : x
2. Step 2: Convert to fraction form
   1,020.69/1,530.50 = 443.25/x
3. Step 3: Cross multiply
   1,020.69x = 1,530.50 × 443.25
4. Step 4: Simplify right side
   1,020.69x = 678,391.91
5. Step 5: Solve for x
   x = 678,391.91/1,020.69
6. Step 6: Final answer
   x = 664.64