Finding the Third Proportional to 639,355 and 1,399,117

Step by Step Solution

1. Step 1: Write the proportion equation
   639,355 : 1,399,117 = 1,399,117 : x
2. Step 2: Convert to fraction form
   639,355/1,399,117 = 1,399,117/x
3. Step 3: Cross multiply
   639,355x = 1,399,117 × 1,399,117
4. Step 4: Simplify right side
   639,355x = 1,957,528,379,689
5. Step 5: Solve for x
   x = 1,957,528,379,689/639,355
6. Step 6: Final answer
   x = 3,061,723.74