Finding the Third Proportional to 405,595.50 and 636,229.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,595.50 : 636,229.50 = 636,229.50 : x
2. Step 2: Convert to fraction form
   405,595.50/636,229.50 = 636,229.50/x
3. Step 3: Cross multiply
   405,595.50x = 636,229.50 × 636,229.50
4. Step 4: Simplify right side
   405,595.50x = 404,787,976,670.25
5. Step 5: Solve for x
   x = 404,787,976,670.25/405,595.50
6. Step 6: Final answer
   x = 998,009.04