Finding the Third Proportional to 105.25 and 215.75

Step by Step Solution

1. Step 1: Write the proportion equation
   105.25 : 215.75 = 215.75 : x
2. Step 2: Convert to fraction form
   105.25/215.75 = 215.75/x
3. Step 3: Cross multiply
   105.25x = 215.75 × 215.75
4. Step 4: Simplify right side
   105.25x = 46,548.06
5. Step 5: Solve for x
   x = 46,548.06/105.25
6. Step 6: Final answer
   x = 442.26