Finding the Fourth Proportional to 1,080.72, 1,489.32 and 769.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.72 : 1,489.32 = 769.68 : x
2. Step 2: Convert to fraction form
   1,080.72/1,489.32 = 769.68/x
3. Step 3: Cross multiply
   1,080.72x = 1,489.32 × 769.68
4. Step 4: Simplify right side
   1,080.72x = 1,146,299.82
5. Step 5: Solve for x
   x = 1,146,299.82/1,080.72
6. Step 6: Final answer
   x = 1,060.68