Finding the Third Proportional to 1,621,404 and 3,519,720

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621,404 : 3,519,720 = 3,519,720 : x
2. Step 2: Convert to fraction form
   1,621,404/3,519,720 = 3,519,720/x
3. Step 3: Cross multiply
   1,621,404x = 3,519,720 × 3,519,720
4. Step 4: Simplify right side
   1,621,404x = 12,388,428,878,400
5. Step 5: Solve for x
   x = 12,388,428,878,400/1,621,404
6. Step 6: Final answer
   x = 7,640,556.50