Finding the Fourth Proportional to 1,016.28, 1,523.52 and 438.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.28 : 1,523.52 = 438.84 : x
2. Step 2: Convert to fraction form
   1,016.28/1,523.52 = 438.84/x
3. Step 3: Cross multiply
   1,016.28x = 1,523.52 × 438.84
4. Step 4: Simplify right side
   1,016.28x = 668,581.52
5. Step 5: Solve for x
   x = 668,581.52/1,016.28
6. Step 6: Final answer
   x = 657.87