Finding the Fourth Proportional to 1,016.32, 1,524.42 and 399.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.32 : 1,524.42 = 399.92 : x
2. Step 2: Convert to fraction form
   1,016.32/1,524.42 = 399.92/x
3. Step 3: Cross multiply
   1,016.32x = 1,524.42 × 399.92
4. Step 4: Simplify right side
   1,016.32x = 609,646.05
5. Step 5: Solve for x
   x = 609,646.05/1,016.32
6. Step 6: Final answer
   x = 599.86