Finding the Third Proportional to 1,399,079 and 2,990,128

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399,079 : 2,990,128 = 2,990,128 : x
2. Step 2: Convert to fraction form
   1,399,079/2,990,128 = 2,990,128/x
3. Step 3: Cross multiply
   1,399,079x = 2,990,128 × 2,990,128
4. Step 4: Simplify right side
   1,399,079x = 8,940,865,456,384
5. Step 5: Solve for x
   x = 8,940,865,456,384/1,399,079
6. Step 6: Final answer
   x = 6,390,536.53