Finding the Third Proportional to 1,392,128 and 3,039,920

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392,128 : 3,039,920 = 3,039,920 : x
2. Step 2: Convert to fraction form
   1,392,128/3,039,920 = 3,039,920/x
3. Step 3: Cross multiply
   1,392,128x = 3,039,920 × 3,039,920
4. Step 4: Simplify right side
   1,392,128x = 9,241,113,606,400
5. Step 5: Solve for x
   x = 9,241,113,606,400/1,392,128
6. Step 6: Final answer
   x = 6,638,120.64