Finding the Third Proportional to 1,691,609 and 3,991,895

Step by Step Solution

1. Step 1: Write the proportion equation
   1,691,609 : 3,991,895 = 3,991,895 : x
2. Step 2: Convert to fraction form
   1,691,609/3,991,895 = 3,991,895/x
3. Step 3: Cross multiply
   1,691,609x = 3,991,895 × 3,991,895
4. Step 4: Simplify right side
   1,691,609x = 15,935,225,691,025
5. Step 5: Solve for x
   x = 15,935,225,691,025/1,691,609
6. Step 6: Final answer
   x = 9,420,158.97