Finding the Third Proportional to 291,174 and 636,648

Step by Step Solution

1. Step 1: Write the proportion equation
   291,174 : 636,648 = 636,648 : x
2. Step 2: Convert to fraction form
   291,174/636,648 = 636,648/x
3. Step 3: Cross multiply
   291,174x = 636,648 × 636,648
4. Step 4: Simplify right side
   291,174x = 405,320,675,904
5. Step 5: Solve for x
   x = 405,320,675,904/291,174
6. Step 6: Final answer
   x = 1,392,022.21