Finding the Third Proportional to 69.75 and 123.75

Step by Step Solution

1. Step 1: Write the proportion equation
   69.75 : 123.75 = 123.75 : x
2. Step 2: Convert to fraction form
   69.75/123.75 = 123.75/x
3. Step 3: Cross multiply
   69.75x = 123.75 × 123.75
4. Step 4: Simplify right side
   69.75x = 15,314.06
5. Step 5: Solve for x
   x = 15,314.06/69.75
6. Step 6: Final answer
   x = 219.56