Finding the Third Proportional to 100.88 and 218.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100.88 : 218.88 = 218.88 : x
2. Step 2: Convert to fraction form
   100.88/218.88 = 218.88/x
3. Step 3: Cross multiply
   100.88x = 218.88 × 218.88
4. Step 4: Simplify right side
   100.88x = 47,906.27
5. Step 5: Solve for x
   x = 47,906.27/100.88
6. Step 6: Final answer
   x = 474.91