Finding the Third Proportional to 1,198,780 and 2,550,128

Step by Step Solution

1. Step 1: Write the proportion equation
   1,198,780 : 2,550,128 = 2,550,128 : x
2. Step 2: Convert to fraction form
   1,198,780/2,550,128 = 2,550,128/x
3. Step 3: Cross multiply
   1,198,780x = 2,550,128 × 2,550,128
4. Step 4: Simplify right side
   1,198,780x = 6,503,152,816,384
5. Step 5: Solve for x
   x = 6,503,152,816,384/1,198,780
6. Step 6: Final answer
   x = 5,424,809.24