Finding the Third Proportional to 639,796.50 and 1,400,121

Step by Step Solution

1. Step 1: Write the proportion equation
   639,796.50 : 1,400,121 = 1,400,121 : x
2. Step 2: Convert to fraction form
   639,796.50/1,400,121 = 1,400,121/x
3. Step 3: Cross multiply
   639,796.50x = 1,400,121 × 1,400,121
4. Step 4: Simplify right side
   639,796.50x = 1,960,338,814,641
5. Step 5: Solve for x
   x = 1,960,338,814,641/639,796.50
6. Step 6: Final answer
   x = 3,064,003.66