Finding the Fourth Proportional to 1,079.62, 1,489.82 and 680.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.62 : 1,489.82 = 680.82 : x
2. Step 2: Convert to fraction form
   1,079.62/1,489.82 = 680.82/x
3. Step 3: Cross multiply
   1,079.62x = 1,489.82 × 680.82
4. Step 4: Simplify right side
   1,079.62x = 1,014,299.25
5. Step 5: Solve for x
   x = 1,014,299.25/1,079.62
6. Step 6: Final answer
   x = 939.50