Finding the Fourth Proportional to 1,016.50, 1,524.15 and 399.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.50 : 1,524.15 = 399.48 : x
2. Step 2: Convert to fraction form
   1,016.50/1,524.15 = 399.48/x
3. Step 3: Cross multiply
   1,016.50x = 1,524.15 × 399.48
4. Step 4: Simplify right side
   1,016.50x = 608,867.44
5. Step 5: Solve for x
   x = 608,867.44/1,016.50
6. Step 6: Final answer
   x = 598.98