Finding the Fourth Proportional to 1,016.01, 1,524.12 and 399.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.01 : 1,524.12 = 399.87 : x
2. Step 2: Convert to fraction form
   1,016.01/1,524.12 = 399.87/x
3. Step 3: Cross multiply
   1,016.01x = 1,524.12 × 399.87
4. Step 4: Simplify right side
   1,016.01x = 609,449.86
5. Step 5: Solve for x
   x = 609,449.86/1,016.01
6. Step 6: Final answer
   x = 599.85