Finding the Third Proportional to 1,800,315 and 3,909,719

Step by Step Solution

1. Step 1: Write the proportion equation
   1,800,315 : 3,909,719 = 3,909,719 : x
2. Step 2: Convert to fraction form
   1,800,315/3,909,719 = 3,909,719/x
3. Step 3: Cross multiply
   1,800,315x = 3,909,719 × 3,909,719
4. Step 4: Simplify right side
   1,800,315x = 15,285,902,658,961
5. Step 5: Solve for x
   x = 15,285,902,658,961/1,800,315
6. Step 6: Final answer
   x = 8,490,682.27