Finding the Third Proportional to 639,333 and 1,387,287

Step by Step Solution

1. Step 1: Write the proportion equation
   639,333 : 1,387,287 = 1,387,287 : x
2. Step 2: Convert to fraction form
   639,333/1,387,287 = 1,387,287/x
3. Step 3: Cross multiply
   639,333x = 1,387,287 × 1,387,287
4. Step 4: Simplify right side
   639,333x = 1,924,565,220,369
5. Step 5: Solve for x
   x = 1,924,565,220,369/639,333
6. Step 6: Final answer
   x = 3,010,270.42