Finding the Fourth Proportional to 1,008.62, 1,391.88 and 589.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.62 : 1,391.88 = 589.18 : x
2. Step 2: Convert to fraction form
   1,008.62/1,391.88 = 589.18/x
3. Step 3: Cross multiply
   1,008.62x = 1,391.88 × 589.18
4. Step 4: Simplify right side
   1,008.62x = 820,067.86
5. Step 5: Solve for x
   x = 820,067.86/1,008.62
6. Step 6: Final answer
   x = 813.06