Finding the Third Proportional to 104.25 and 215.81

Step by Step Solution

1. Step 1: Write the proportion equation
   104.25 : 215.81 = 215.81 : x
2. Step 2: Convert to fraction form
   104.25/215.81 = 215.81/x
3. Step 3: Cross multiply
   104.25x = 215.81 × 215.81
4. Step 4: Simplify right side
   104.25x = 46,575.04
5. Step 5: Solve for x
   x = 46,575.04/104.25
6. Step 6: Final answer
   x = 446.76