Finding the Third Proportional to 66.56 and 143.09

Step by Step Solution

1. Step 1: Write the proportion equation
   66.56 : 143.09 = 143.09 : x
2. Step 2: Convert to fraction form
   66.56/143.09 = 143.09/x
3. Step 3: Cross multiply
   66.56x = 143.09 × 143.09
4. Step 4: Simplify right side
   66.56x = 20,476.10
5. Step 5: Solve for x
   x = 20,476.10/66.56
6. Step 6: Final answer
   x = 307.62