Finding the Third Proportional to 1,005,399 and 2,191,455

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005,399 : 2,191,455 = 2,191,455 : x
2. Step 2: Convert to fraction form
   1,005,399/2,191,455 = 2,191,455/x
3. Step 3: Cross multiply
   1,005,399x = 2,191,455 × 2,191,455
4. Step 4: Simplify right side
   1,005,399x = 4,802,475,017,025
5. Step 5: Solve for x
   x = 4,802,475,017,025/1,005,399
6. Step 6: Final answer
   x = 4,776,685.69