Finding the Third Proportional to 663,290 and 1,421,212

Step by Step Solution

1. Step 1: Write the proportion equation
   663,290 : 1,421,212 = 1,421,212 : x
2. Step 2: Convert to fraction form
   663,290/1,421,212 = 1,421,212/x
3. Step 3: Cross multiply
   663,290x = 1,421,212 × 1,421,212
4. Step 4: Simplify right side
   663,290x = 2,019,843,548,944
5. Step 5: Solve for x
   x = 2,019,843,548,944/663,290
6. Step 6: Final answer
   x = 3,045,189.21