Finding the Third Proportional to 100.29 and 216.60

Step by Step Solution

1. Step 1: Write the proportion equation
   100.29 : 216.60 = 216.60 : x
2. Step 2: Convert to fraction form
   100.29/216.60 = 216.60/x
3. Step 3: Cross multiply
   100.29x = 216.60 × 216.60
4. Step 4: Simplify right side
   100.29x = 46,915.50
5. Step 5: Solve for x
   x = 46,915.50/100.29
6. Step 6: Final answer
   x = 467.79