Finding the Fourth Proportional to 1,020.84, 1,530.59 and 404.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.84 : 1,530.59 = 404.84 : x
2. Step 2: Convert to fraction form
   1,020.84/1,530.59 = 404.84/x
3. Step 3: Cross multiply
   1,020.84x = 1,530.59 × 404.84
4. Step 4: Simplify right side
   1,020.84x = 619,634.38
5. Step 5: Solve for x
   x = 619,634.38/1,020.84
6. Step 6: Final answer
   x = 606.98