Finding the Third Proportional to 290,616 and 627,105

Step by Step Solution

1. Step 1: Write the proportion equation
   290,616 : 627,105 = 627,105 : x
2. Step 2: Convert to fraction form
   290,616/627,105 = 627,105/x
3. Step 3: Cross multiply
   290,616x = 627,105 × 627,105
4. Step 4: Simplify right side
   290,616x = 393,260,681,025
5. Step 5: Solve for x
   x = 393,260,681,025/290,616
6. Step 6: Final answer
   x = 1,353,196.94