Finding the Third Proportional to 91.28 and 142.38

Step by Step Solution

1. Step 1: Write the proportion equation
   91.28 : 142.38 = 142.38 : x
2. Step 2: Convert to fraction form
   91.28/142.38 = 142.38/x
3. Step 3: Cross multiply
   91.28x = 142.38 × 142.38
4. Step 4: Simplify right side
   91.28x = 20,272.87
5. Step 5: Solve for x
   x = 20,272.87/91.28
6. Step 6: Final answer
   x = 222.09