Finding the Third Proportional to 642,911 and 1,400,116

Step by Step Solution

1. Step 1: Write the proportion equation
   642,911 : 1,400,116 = 1,400,116 : x
2. Step 2: Convert to fraction form
   642,911/1,400,116 = 1,400,116/x
3. Step 3: Cross multiply
   642,911x = 1,400,116 × 1,400,116
4. Step 4: Simplify right side
   642,911x = 1,960,324,813,456
5. Step 5: Solve for x
   x = 1,960,324,813,456/642,911
6. Step 6: Final answer
   x = 3,049,138.70