Finding the Third Proportional to 718.56 and 979.59

Step by Step Solution

1. Step 1: Write the proportion equation
   718.56 : 979.59 = 979.59 : x
2. Step 2: Convert to fraction form
   718.56/979.59 = 979.59/x
3. Step 3: Cross multiply
   718.56x = 979.59 × 979.59
4. Step 4: Simplify right side
   718.56x = 959,603.92
5. Step 5: Solve for x
   x = 959,603.92/718.56
6. Step 6: Final answer
   x = 1,335.46