Finding the Third Proportional to 3,912,113 and 8,402,689

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912,113 : 8,402,689 = 8,402,689 : x
2. Step 2: Convert to fraction form
   3,912,113/8,402,689 = 8,402,689/x
3. Step 3: Cross multiply
   3,912,113x = 8,402,689 × 8,402,689
4. Step 4: Simplify right side
   3,912,113x = 70,605,182,430,721
5. Step 5: Solve for x
   x = 70,605,182,430,721/3,912,113
6. Step 6: Final answer
   x = 18,047,838.20