Finding the Fourth Proportional to 1,020.84, 1,531.49 and 404.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.84 : 1,531.49 = 404.39 : x
2. Step 2: Convert to fraction form
   1,020.84/1,531.49 = 404.39/x
3. Step 3: Cross multiply
   1,020.84x = 1,531.49 × 404.39
4. Step 4: Simplify right side
   1,020.84x = 619,309.56
5. Step 5: Solve for x
   x = 619,309.56/1,020.84
6. Step 6: Final answer
   x = 606.67