Finding the Fourth Proportional to 1,016.39, 1,401.62 and 618.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.39 : 1,401.62 = 618.12 : x
2. Step 2: Convert to fraction form
   1,016.39/1,401.62 = 618.12/x
3. Step 3: Cross multiply
   1,016.39x = 1,401.62 × 618.12
4. Step 4: Simplify right side
   1,016.39x = 866,369.35
5. Step 5: Solve for x
   x = 866,369.35/1,016.39
6. Step 6: Final answer
   x = 852.40