Finding the Third Proportional to 401,720 and 622,012

Step by Step Solution

1. Step 1: Write the proportion equation
   401,720 : 622,012 = 622,012 : x
2. Step 2: Convert to fraction form
   401,720/622,012 = 622,012/x
3. Step 3: Cross multiply
   401,720x = 622,012 × 622,012
4. Step 4: Simplify right side
   401,720x = 386,898,928,144
5. Step 5: Solve for x
   x = 386,898,928,144/401,720
6. Step 6: Final answer
   x = 963,105.96