Finding the Fourth Proportional to 1,080.96, 1,492.56 and 688.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.96 : 1,492.56 = 688.56 : x
2. Step 2: Convert to fraction form
   1,080.96/1,492.56 = 688.56/x
3. Step 3: Cross multiply
   1,080.96x = 1,492.56 × 688.56
4. Step 4: Simplify right side
   1,080.96x = 1,027,717.11
5. Step 5: Solve for x
   x = 1,027,717.11/1,080.96
6. Step 6: Final answer
   x = 950.74