Finding the Third Proportional to 66.21 and 142.03

Step by Step Solution

1. Step 1: Write the proportion equation
   66.21 : 142.03 = 142.03 : x
2. Step 2: Convert to fraction form
   66.21/142.03 = 142.03/x
3. Step 3: Cross multiply
   66.21x = 142.03 × 142.03
4. Step 4: Simplify right side
   66.21x = 20,171.63
5. Step 5: Solve for x
   x = 20,171.63/66.21
6. Step 6: Final answer
   x = 304.67