Finding the Third Proportional to 643,766 and 1,385,704

Step by Step Solution

1. Step 1: Write the proportion equation
   643,766 : 1,385,704 = 1,385,704 : x
2. Step 2: Convert to fraction form
   643,766/1,385,704 = 1,385,704/x
3. Step 3: Cross multiply
   643,766x = 1,385,704 × 1,385,704
4. Step 4: Simplify right side
   643,766x = 1,920,175,575,616
5. Step 5: Solve for x
   x = 1,920,175,575,616/643,766
6. Step 6: Final answer
   x = 2,982,722.88