Finding the Third Proportional to 557,390 and 1,221,088

Step by Step Solution

1. Step 1: Write the proportion equation
   557,390 : 1,221,088 = 1,221,088 : x
2. Step 2: Convert to fraction form
   557,390/1,221,088 = 1,221,088/x
3. Step 3: Cross multiply
   557,390x = 1,221,088 × 1,221,088
4. Step 4: Simplify right side
   557,390x = 1,491,055,903,744
5. Step 5: Solve for x
   x = 1,491,055,903,744/557,390
6. Step 6: Final answer
   x = 2,675,067.55