Finding the Third Proportional to 123.25 and 286.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123.25 : 286.50 = 286.50 : x
2. Step 2: Convert to fraction form
   123.25/286.50 = 286.50/x
3. Step 3: Cross multiply
   123.25x = 286.50 × 286.50
4. Step 4: Simplify right side
   123.25x = 82,082.25
5. Step 5: Solve for x
   x = 82,082.25/123.25
6. Step 6: Final answer
   x = 665.98