Finding the Fourth Proportional to 1,020.09, 1,530.50 and 404.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.09 : 1,530.50 = 404.22 : x
2. Step 2: Convert to fraction form
   1,020.09/1,530.50 = 404.22/x
3. Step 3: Cross multiply
   1,020.09x = 1,530.50 × 404.22
4. Step 4: Simplify right side
   1,020.09x = 618,662.43
5. Step 5: Solve for x
   x = 618,662.43/1,020.09
6. Step 6: Final answer
   x = 606.48