Finding the Fourth Proportional to 1,016.55, 1,525.50 and 400.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.55 : 1,525.50 = 400.18 : x
2. Step 2: Convert to fraction form
   1,016.55/1,525.50 = 400.18/x
3. Step 3: Cross multiply
   1,016.55x = 1,525.50 × 400.18
4. Step 4: Simplify right side
   1,016.55x = 610,474.59
5. Step 5: Solve for x
   x = 610,474.59/1,016.55
6. Step 6: Final answer
   x = 600.54