Finding the Third Proportional to 418,009 and 636,793.50

Step by Step Solution

1. Step 1: Write the proportion equation
   418,009 : 636,793.50 = 636,793.50 : x
2. Step 2: Convert to fraction form
   418,009/636,793.50 = 636,793.50/x
3. Step 3: Cross multiply
   418,009x = 636,793.50 × 636,793.50
4. Step 4: Simplify right side
   418,009x = 405,505,961,642.25
5. Step 5: Solve for x
   x = 405,505,961,642.25/418,009
6. Step 6: Final answer
   x = 970,089.07