Finding the Third Proportional to 900,345 and 1,921,218

Step by Step Solution

1. Step 1: Write the proportion equation
   900,345 : 1,921,218 = 1,921,218 : x
2. Step 2: Convert to fraction form
   900,345/1,921,218 = 1,921,218/x
3. Step 3: Cross multiply
   900,345x = 1,921,218 × 1,921,218
4. Step 4: Simplify right side
   900,345x = 3,691,078,603,524
5. Step 5: Solve for x
   x = 3,691,078,603,524/900,345
6. Step 6: Final answer
   x = 4,099,626.92