Finding the Third Proportional to 100.25 and 212.73

Step by Step Solution

1. Step 1: Write the proportion equation
   100.25 : 212.73 = 212.73 : x
2. Step 2: Convert to fraction form
   100.25/212.73 = 212.73/x
3. Step 3: Cross multiply
   100.25x = 212.73 × 212.73
4. Step 4: Simplify right side
   100.25x = 45,254.25
5. Step 5: Solve for x
   x = 45,254.25/100.25
6. Step 6: Final answer
   x = 451.42