Finding the Fourth Proportional to 1,081.31, 1,492.17 and 688.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.31 : 1,492.17 = 688.32 : x
2. Step 2: Convert to fraction form
   1,081.31/1,492.17 = 688.32/x
3. Step 3: Cross multiply
   1,081.31x = 1,492.17 × 688.32
4. Step 4: Simplify right side
   1,081.31x = 1,027,090.45
5. Step 5: Solve for x
   x = 1,027,090.45/1,081.31
6. Step 6: Final answer
   x = 949.86