Finding the Third Proportional to 639,288 and 992,550

Step by Step Solution

1. Step 1: Write the proportion equation
   639,288 : 992,550 = 992,550 : x
2. Step 2: Convert to fraction form
   639,288/992,550 = 992,550/x
3. Step 3: Cross multiply
   639,288x = 992,550 × 992,550
4. Step 4: Simplify right side
   639,288x = 985,155,502,500
5. Step 5: Solve for x
   x = 985,155,502,500/639,288
6. Step 6: Final answer
   x = 1,541,019.86