Finding the Fourth Proportional to 1,016.25, 1,523.56 and 439.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.25 : 1,523.56 = 439.53 : x
2. Step 2: Convert to fraction form
   1,016.25/1,523.56 = 439.53/x
3. Step 3: Cross multiply
   1,016.25x = 1,523.56 × 439.53
4. Step 4: Simplify right side
   1,016.25x = 669,650.33
5. Step 5: Solve for x
   x = 669,650.33/1,016.25
6. Step 6: Final answer
   x = 658.94