Finding the Fourth Proportional to 1,081.39, 1,492.09 and 688.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.39 : 1,492.09 = 688.27 : x
2. Step 2: Convert to fraction form
   1,081.39/1,492.09 = 688.27/x
3. Step 3: Cross multiply
   1,081.39x = 1,492.09 × 688.27
4. Step 4: Simplify right side
   1,081.39x = 1,026,960.78
5. Step 5: Solve for x
   x = 1,026,960.78/1,081.39
6. Step 6: Final answer
   x = 949.67