Finding the Fourth Proportional to 1,016.76, 1,524.78 and 439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.76 : 1,524.78 = 439.50 : x
2. Step 2: Convert to fraction form
   1,016.76/1,524.78 = 439.50/x
3. Step 3: Cross multiply
   1,016.76x = 1,524.78 × 439.50
4. Step 4: Simplify right side
   1,016.76x = 670,140.81
5. Step 5: Solve for x
   x = 670,140.81/1,016.76
6. Step 6: Final answer
   x = 659.09