Finding the Third Proportional to 82.69 and 218.53

Step by Step Solution

1. Step 1: Write the proportion equation
   82.69 : 218.53 = 218.53 : x
2. Step 2: Convert to fraction form
   82.69/218.53 = 218.53/x
3. Step 3: Cross multiply
   82.69x = 218.53 × 218.53
4. Step 4: Simplify right side
   82.69x = 47,755.91
5. Step 5: Solve for x
   x = 47,755.91/82.69
6. Step 6: Final answer
   x = 577.55