Finding the Third Proportional to 639,720 and 956,060

Step by Step Solution

1. Step 1: Write the proportion equation
   639,720 : 956,060 = 956,060 : x
2. Step 2: Convert to fraction form
   639,720/956,060 = 956,060/x
3. Step 3: Cross multiply
   639,720x = 956,060 × 956,060
4. Step 4: Simplify right side
   639,720x = 914,050,723,600
5. Step 5: Solve for x
   x = 914,050,723,600/639,720
6. Step 6: Final answer
   x = 1,428,829.37