Finding the Third Proportional to 123.09 and 268.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123.09 : 268.31 = 268.31 : x
2. Step 2: Convert to fraction form
   123.09/268.31 = 268.31/x
3. Step 3: Cross multiply
   123.09x = 268.31 × 268.31
4. Step 4: Simplify right side
   123.09x = 71,991.60
5. Step 5: Solve for x
   x = 71,991.60/123.09
6. Step 6: Final answer
   x = 584.85