Finding the Third Proportional to 2,120,436 and 4,419,720

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120,436 : 4,419,720 = 4,419,720 : x
2. Step 2: Convert to fraction form
   2,120,436/4,419,720 = 4,419,720/x
3. Step 3: Cross multiply
   2,120,436x = 4,419,720 × 4,419,720
4. Step 4: Simplify right side
   2,120,436x = 19,533,924,878,400
5. Step 5: Solve for x
   x = 19,533,924,878,400/2,120,436
6. Step 6: Final answer
   x = 9,212,220.92