Finding the Third Proportional to 386.81 and 563.06

Step by Step Solution

1. Step 1: Write the proportion equation
   386.81 : 563.06 = 563.06 : x
2. Step 2: Convert to fraction form
   386.81/563.06 = 563.06/x
3. Step 3: Cross multiply
   386.81x = 563.06 × 563.06
4. Step 4: Simplify right side
   386.81x = 317,039.38
5. Step 5: Solve for x
   x = 317,039.38/386.81
6. Step 6: Final answer
   x = 819.62