Finding the Fourth Proportional to 1,020.78, 1,530.27 and 443.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.78 : 1,530.27 = 443.34 : x
2. Step 2: Convert to fraction form
   1,020.78/1,530.27 = 443.34/x
3. Step 3: Cross multiply
   1,020.78x = 1,530.27 × 443.34
4. Step 4: Simplify right side
   1,020.78x = 678,429.90
5. Step 5: Solve for x
   x = 678,429.90/1,020.78
6. Step 6: Final answer
   x = 664.62