Finding the Third Proportional to 291,223 and 636,326

Step by Step Solution

1. Step 1: Write the proportion equation
   291,223 : 636,326 = 636,326 : x
2. Step 2: Convert to fraction form
   291,223/636,326 = 636,326/x
3. Step 3: Cross multiply
   291,223x = 636,326 × 636,326
4. Step 4: Simplify right side
   291,223x = 404,910,778,276
5. Step 5: Solve for x
   x = 404,910,778,276/291,223
6. Step 6: Final answer
   x = 1,390,380.49