Finding the Third Proportional to 405,825 and 636,601.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,825 : 636,601.50 = 636,601.50 : x
2. Step 2: Convert to fraction form
   405,825/636,601.50 = 636,601.50/x
3. Step 3: Cross multiply
   405,825x = 636,601.50 × 636,601.50
4. Step 4: Simplify right side
   405,825x = 405,261,469,802.25
5. Step 5: Solve for x
   x = 405,261,469,802.25/405,825
6. Step 6: Final answer
   x = 998,611.40