Finding the Third Proportional to 405,684 and 636,376.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,684 : 636,376.50 = 636,376.50 : x
2. Step 2: Convert to fraction form
   405,684/636,376.50 = 636,376.50/x
3. Step 3: Cross multiply
   405,684x = 636,376.50 × 636,376.50
4. Step 4: Simplify right side
   405,684x = 404,975,049,752.25
5. Step 5: Solve for x
   x = 404,975,049,752.25/405,684
6. Step 6: Final answer
   x = 998,252.46