Finding the Third Proportional to 82.90 and 82.90

Step by Step Solution

1. Step 1: Write the proportion equation
   82.90 : 82.90 = 82.90 : x
2. Step 2: Convert to fraction form
   82.90/82.90 = 82.90/x
3. Step 3: Cross multiply
   82.90x = 82.90 × 82.90
4. Step 4: Simplify right side
   82.90x = 6,872.15
5. Step 5: Solve for x
   x = 6,872.15/82.90
6. Step 6: Final answer
   x = 82.90