Finding the Third Proportional to 1,388,211 and 2,099,799

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,211 : 2,099,799 = 2,099,799 : x
2. Step 2: Convert to fraction form
   1,388,211/2,099,799 = 2,099,799/x
3. Step 3: Cross multiply
   1,388,211x = 2,099,799 × 2,099,799
4. Step 4: Simplify right side
   1,388,211x = 4,409,155,840,401
5. Step 5: Solve for x
   x = 4,409,155,840,401/1,388,211
6. Step 6: Final answer
   x = 3,176,142.42