Finding the Third Proportional to 639,634 and 1,392,019

Step by Step Solution

1. Step 1: Write the proportion equation
   639,634 : 1,392,019 = 1,392,019 : x
2. Step 2: Convert to fraction form
   639,634/1,392,019 = 1,392,019/x
3. Step 3: Cross multiply
   639,634x = 1,392,019 × 1,392,019
4. Step 4: Simplify right side
   639,634x = 1,937,716,896,361
5. Step 5: Solve for x
   x = 1,937,716,896,361/639,634
6. Step 6: Final answer
   x = 3,029,415.10