Finding the Third Proportional to 290,425.50 and 636,951

Step by Step Solution

1. Step 1: Write the proportion equation
   290,425.50 : 636,951 = 636,951 : x
2. Step 2: Convert to fraction form
   290,425.50/636,951 = 636,951/x
3. Step 3: Cross multiply
   290,425.50x = 636,951 × 636,951
4. Step 4: Simplify right side
   290,425.50x = 405,706,576,401
5. Step 5: Solve for x
   x = 405,706,576,401/290,425.50
6. Step 6: Final answer
   x = 1,396,938.55