Finding the Third Proportional to 663,286 and 1,421,198

Step by Step Solution

1. Step 1: Write the proportion equation
   663,286 : 1,421,198 = 1,421,198 : x
2. Step 2: Convert to fraction form
   663,286/1,421,198 = 1,421,198/x
3. Step 3: Cross multiply
   663,286x = 1,421,198 × 1,421,198
4. Step 4: Simplify right side
   663,286x = 2,019,803,755,204
5. Step 5: Solve for x
   x = 2,019,803,755,204/663,286
6. Step 6: Final answer
   x = 3,045,147.58