Finding the Third Proportional to 66.21 and 100.38

Step by Step Solution

1. Step 1: Write the proportion equation
   66.21 : 100.38 = 100.38 : x
2. Step 2: Convert to fraction form
   66.21/100.38 = 100.38/x
3. Step 3: Cross multiply
   66.21x = 100.38 × 100.38
4. Step 4: Simplify right side
   66.21x = 10,076.12
5. Step 5: Solve for x
   x = 10,076.12/66.21
6. Step 6: Final answer
   x = 152.19