Finding the Third Proportional to 210.56 and 308.06

Step by Step Solution

1. Step 1: Write the proportion equation
   210.56 : 308.06 = 308.06 : x
2. Step 2: Convert to fraction form
   210.56/308.06 = 308.06/x
3. Step 3: Cross multiply
   210.56x = 308.06 × 308.06
4. Step 4: Simplify right side
   210.56x = 94,902.50
5. Step 5: Solve for x
   x = 94,902.50/210.56
6. Step 6: Final answer
   x = 450.71