Finding the Third Proportional to 312,667.25 and 636,375.25

Step by Step Solution

1. Step 1: Write the proportion equation
   312,667.25 : 636,375.25 = 636,375.25 : x
2. Step 2: Convert to fraction form
   312,667.25/636,375.25 = 636,375.25/x
3. Step 3: Cross multiply
   312,667.25x = 636,375.25 × 636,375.25
4. Step 4: Simplify right side
   312,667.25x = 404,973,458,812.56
5. Step 5: Solve for x
   x = 404,973,458,812.56/312,667.25
6. Step 6: Final answer
   x = 1,295,221.87