Finding the Third Proportional to 405,607.50 and 636,249.38

Step by Step Solution

1. Step 1: Write the proportion equation
   405,607.50 : 636,249.38 = 636,249.38 : x
2. Step 2: Convert to fraction form
   405,607.50/636,249.38 = 636,249.38/x
3. Step 3: Cross multiply
   405,607.50x = 636,249.38 × 636,249.38
4. Step 4: Simplify right side
   405,607.50x = 404,813,267,187.89
5. Step 5: Solve for x
   x = 404,813,267,187.89/405,607.50
6. Step 6: Final answer
   x = 998,041.87