Finding the Third Proportional to 1,139,618 and 2,431,780

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,618 : 2,431,780 = 2,431,780 : x
2. Step 2: Convert to fraction form
   1,139,618/2,431,780 = 2,431,780/x
3. Step 3: Cross multiply
   1,139,618x = 2,431,780 × 2,431,780
4. Step 4: Simplify right side
   1,139,618x = 5,913,553,968,400
5. Step 5: Solve for x
   x = 5,913,553,968,400/1,139,618
6. Step 6: Final answer
   x = 5,189,066.84