Finding the Third Proportional to 312,635.81 and 636,321.38

Step by Step Solution

1. Step 1: Write the proportion equation
   312,635.81 : 636,321.38 = 636,321.38 : x
2. Step 2: Convert to fraction form
   312,635.81/636,321.38 = 636,321.38/x
3. Step 3: Cross multiply
   312,635.81x = 636,321.38 × 636,321.38
4. Step 4: Simplify right side
   312,635.81x = 404,904,892,281.89
5. Step 5: Solve for x
   x = 404,904,892,281.89/312,635.81
6. Step 6: Final answer
   x = 1,295,132.79