Finding the Fourth Proportional to 1,016.69, 1,403.12 and 618.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.69 : 1,403.12 = 618.32 : x
2. Step 2: Convert to fraction form
   1,016.69/1,403.12 = 618.32/x
3. Step 3: Cross multiply
   1,016.69x = 1,403.12 × 618.32
4. Step 4: Simplify right side
   1,016.69x = 867,574.32
5. Step 5: Solve for x
   x = 867,574.32/1,016.69
6. Step 6: Final answer
   x = 853.34