Finding the Fourth Proportional to 1,021.53, 1,531.41 and 404.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.53 : 1,531.41 = 404.82 : x
2. Step 2: Convert to fraction form
   1,021.53/1,531.41 = 404.82/x
3. Step 3: Cross multiply
   1,021.53x = 1,531.41 × 404.82
4. Step 4: Simplify right side
   1,021.53x = 619,945.40
5. Step 5: Solve for x
   x = 619,945.40/1,021.53
6. Step 6: Final answer
   x = 606.88