Finding the Third Proportional to 67.15 and 145.56

Step by Step Solution

1. Step 1: Write the proportion equation
   67.15 : 145.56 = 145.56 : x
2. Step 2: Convert to fraction form
   67.15/145.56 = 145.56/x
3. Step 3: Cross multiply
   67.15x = 145.56 × 145.56
4. Step 4: Simplify right side
   67.15x = 21,189.01
5. Step 5: Solve for x
   x = 21,189.01/67.15
6. Step 6: Final answer
   x = 315.55