Finding the Fourth Proportional to 1,017.19, 1,403.98 and 618.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.19 : 1,403.98 = 618.86 : x
2. Step 2: Convert to fraction form
   1,017.19/1,403.98 = 618.86/x
3. Step 3: Cross multiply
   1,017.19x = 1,403.98 × 618.86
4. Step 4: Simplify right side
   1,017.19x = 868,860.04
5. Step 5: Solve for x
   x = 868,860.04/1,017.19
6. Step 6: Final answer
   x = 854.18