Finding the Third Proportional to 639,345 and 1,357,499

Step by Step Solution

1. Step 1: Write the proportion equation
   639,345 : 1,357,499 = 1,357,499 : x
2. Step 2: Convert to fraction form
   639,345/1,357,499 = 1,357,499/x
3. Step 3: Cross multiply
   639,345x = 1,357,499 × 1,357,499
4. Step 4: Simplify right side
   639,345x = 1,842,803,535,001
5. Step 5: Solve for x
   x = 1,842,803,535,001/639,345
6. Step 6: Final answer
   x = 2,882,330.41