Finding the Third Proportional to 621,684 and 1,342,620

Step by Step Solution

1. Step 1: Write the proportion equation
   621,684 : 1,342,620 = 1,342,620 : x
2. Step 2: Convert to fraction form
   621,684/1,342,620 = 1,342,620/x
3. Step 3: Cross multiply
   621,684x = 1,342,620 × 1,342,620
4. Step 4: Simplify right side
   621,684x = 1,802,628,464,400
5. Step 5: Solve for x
   x = 1,802,628,464,400/621,684
6. Step 6: Final answer
   x = 2,899,589.61