Finding the Third Proportional to 290,502 and 636,997.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,502 : 636,997.50 = 636,997.50 : x
2. Step 2: Convert to fraction form
   290,502/636,997.50 = 636,997.50/x
3. Step 3: Cross multiply
   290,502x = 636,997.50 × 636,997.50
4. Step 4: Simplify right side
   290,502x = 405,765,815,006.25
5. Step 5: Solve for x
   x = 405,765,815,006.25/290,502
6. Step 6: Final answer
   x = 1,396,774.60