Finding the Third Proportional to 290,788 and 627,404

Step by Step Solution

1. Step 1: Write the proportion equation
   290,788 : 627,404 = 627,404 : x
2. Step 2: Convert to fraction form
   290,788/627,404 = 627,404/x
3. Step 3: Cross multiply
   290,788x = 627,404 × 627,404
4. Step 4: Simplify right side
   290,788x = 393,635,779,216
5. Step 5: Solve for x
   x = 393,635,779,216/290,788
6. Step 6: Final answer
   x = 1,353,686.46