Finding the Third Proportional to 143.56 and 316.94

Step by Step Solution

1. Step 1: Write the proportion equation
   143.56 : 316.94 = 316.94 : x
2. Step 2: Convert to fraction form
   143.56/316.94 = 316.94/x
3. Step 3: Cross multiply
   143.56x = 316.94 × 316.94
4. Step 4: Simplify right side
   143.56x = 100,449.38
5. Step 5: Solve for x
   x = 100,449.38/143.56
6. Step 6: Final answer
   x = 699.69