Finding the Third Proportional to 100.55 and 212.48

Step by Step Solution

1. Step 1: Write the proportion equation
   100.55 : 212.48 = 212.48 : x
2. Step 2: Convert to fraction form
   100.55/212.48 = 212.48/x
3. Step 3: Cross multiply
   100.55x = 212.48 × 212.48
4. Step 4: Simplify right side
   100.55x = 45,149.61
5. Step 5: Solve for x
   x = 45,149.61/100.55
6. Step 6: Final answer
   x = 449.04