Finding the Third Proportional to 518.06 and 808.59

Step by Step Solution

1. Step 1: Write the proportion equation
   518.06 : 808.59 = 808.59 : x
2. Step 2: Convert to fraction form
   518.06/808.59 = 808.59/x
3. Step 3: Cross multiply
   518.06x = 808.59 × 808.59
4. Step 4: Simplify right side
   518.06x = 653,823.85
5. Step 5: Solve for x
   x = 653,823.85/518.06
6. Step 6: Final answer
   x = 1,262.06