Finding the Third Proportional to 309,762 and 636,198.75

Step by Step Solution

1. Step 1: Write the proportion equation
   309,762 : 636,198.75 = 636,198.75 : x
2. Step 2: Convert to fraction form
   309,762/636,198.75 = 636,198.75/x
3. Step 3: Cross multiply
   309,762x = 636,198.75 × 636,198.75
4. Step 4: Simplify right side
   309,762x = 404,748,849,501.56
5. Step 5: Solve for x
   x = 404,748,849,501.56/309,762
6. Step 6: Final answer
   x = 1,306,644.62