Finding the Fourth Proportional to 1,081.89, 1,493.10 and 689.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.89 : 1,493.10 = 689.18 : x
2. Step 2: Convert to fraction form
   1,081.89/1,493.10 = 689.18/x
3. Step 3: Cross multiply
   1,081.89x = 1,493.10 × 689.18
4. Step 4: Simplify right side
   1,081.89x = 1,029,007.19
5. Step 5: Solve for x
   x = 1,029,007.19/1,081.89
6. Step 6: Final answer
   x = 951.12