Finding the Third Proportional to 1,420,596 and 3,121,128

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420,596 : 3,121,128 = 3,121,128 : x
2. Step 2: Convert to fraction form
   1,420,596/3,121,128 = 3,121,128/x
3. Step 3: Cross multiply
   1,420,596x = 3,121,128 × 3,121,128
4. Step 4: Simplify right side
   1,420,596x = 9,741,439,992,384
5. Step 5: Solve for x
   x = 9,741,439,992,384/1,420,596
6. Step 6: Final answer
   x = 6,857,290.88