Finding the Fourth Proportional to 1,016.08, 1,523.16 and 399.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.08 : 1,523.16 = 399.58 : x
2. Step 2: Convert to fraction form
   1,016.08/1,523.16 = 399.58/x
3. Step 3: Cross multiply
   1,016.08x = 1,523.16 × 399.58
4. Step 4: Simplify right side
   1,016.08x = 608,624.27
5. Step 5: Solve for x
   x = 608,624.27/1,016.08
6. Step 6: Final answer
   x = 598.99