Finding the Third Proportional to 1,215,904 and 2,086,288

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,904 : 2,086,288 = 2,086,288 : x
2. Step 2: Convert to fraction form
   1,215,904/2,086,288 = 2,086,288/x
3. Step 3: Cross multiply
   1,215,904x = 2,086,288 × 2,086,288
4. Step 4: Simplify right side
   1,215,904x = 4,352,597,618,944
5. Step 5: Solve for x
   x = 4,352,597,618,944/1,215,904
6. Step 6: Final answer
   x = 3,579,721.44