Finding the Third Proportional to 643,822 and 1,385,820

Step by Step Solution

1. Step 1: Write the proportion equation
   643,822 : 1,385,820 = 1,385,820 : x
2. Step 2: Convert to fraction form
   643,822/1,385,820 = 1,385,820/x
3. Step 3: Cross multiply
   643,822x = 1,385,820 × 1,385,820
4. Step 4: Simplify right side
   643,822x = 1,920,497,072,400
5. Step 5: Solve for x
   x = 1,920,497,072,400/643,822
6. Step 6: Final answer
   x = 2,982,962.79