Finding the Third Proportional to 639,360 and 1,399,126.50

Step by Step Solution

1. Step 1: Write the proportion equation
   639,360 : 1,399,126.50 = 1,399,126.50 : x
2. Step 2: Convert to fraction form
   639,360/1,399,126.50 = 1,399,126.50/x
3. Step 3: Cross multiply
   639,360x = 1,399,126.50 × 1,399,126.50
4. Step 4: Simplify right side
   639,360x = 1,957,554,963,002.25
5. Step 5: Solve for x
   x = 1,957,554,963,002.25/639,360
6. Step 6: Final answer
   x = 3,061,741.37