Finding the Third Proportional to 154.80 and 316.72

Step by Step Solution

1. Step 1: Write the proportion equation
   154.80 : 316.72 = 316.72 : x
2. Step 2: Convert to fraction form
   154.80/316.72 = 316.72/x
3. Step 3: Cross multiply
   154.80x = 316.72 × 316.72
4. Step 4: Simplify right side
   154.80x = 100,313.24
5. Step 5: Solve for x
   x = 100,313.24/154.80
6. Step 6: Final answer
   x = 648.01