Finding the Third Proportional to 291,206 and 636,298

Step by Step Solution

1. Step 1: Write the proportion equation
   291,206 : 636,298 = 636,298 : x
2. Step 2: Convert to fraction form
   291,206/636,298 = 636,298/x
3. Step 3: Cross multiply
   291,206x = 636,298 × 636,298
4. Step 4: Simplify right side
   291,206x = 404,875,144,804
5. Step 5: Solve for x
   x = 404,875,144,804/291,206
6. Step 6: Final answer
   x = 1,390,339.30