Finding the Fourth Proportional to 1,008.94, 1,392.30 and 589.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.94 : 1,392.30 = 589.31 : x
2. Step 2: Convert to fraction form
   1,008.94/1,392.30 = 589.31/x
3. Step 3: Cross multiply
   1,008.94x = 1,392.30 × 589.31
4. Step 4: Simplify right side
   1,008.94x = 820,496.31
5. Step 5: Solve for x
   x = 820,496.31/1,008.94
6. Step 6: Final answer
   x = 813.23