Finding the Third Proportional to 778,042 and 1,688,872

Step by Step Solution

1. Step 1: Write the proportion equation
   778,042 : 1,688,872 = 1,688,872 : x
2. Step 2: Convert to fraction form
   778,042/1,688,872 = 1,688,872/x
3. Step 3: Cross multiply
   778,042x = 1,688,872 × 1,688,872
4. Step 4: Simplify right side
   778,042x = 2,852,288,632,384
5. Step 5: Solve for x
   x = 2,852,288,632,384/778,042
6. Step 6: Final answer
   x = 3,665,982.85