Finding the Fourth Proportional to 1,017.32, 1,403.89 and 618.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.32 : 1,403.89 = 618.84 : x
2. Step 2: Convert to fraction form
   1,017.32/1,403.89 = 618.84/x
3. Step 3: Cross multiply
   1,017.32x = 1,403.89 × 618.84
4. Step 4: Simplify right side
   1,017.32x = 868,781.74
5. Step 5: Solve for x
   x = 868,781.74/1,017.32
6. Step 6: Final answer
   x = 853.99