Finding the Third Proportional to 317,406 and 661,116

Step by Step Solution

1. Step 1: Write the proportion equation
   317,406 : 661,116 = 661,116 : x
2. Step 2: Convert to fraction form
   317,406/661,116 = 661,116/x
3. Step 3: Cross multiply
   317,406x = 661,116 × 661,116
4. Step 4: Simplify right side
   317,406x = 437,074,365,456
5. Step 5: Solve for x
   x = 437,074,365,456/317,406
6. Step 6: Final answer
   x = 1,377,019.86