Finding the Third Proportional to 646,618 and 1,405,172

Step by Step Solution

1. Step 1: Write the proportion equation
   646,618 : 1,405,172 = 1,405,172 : x
2. Step 2: Convert to fraction form
   646,618/1,405,172 = 1,405,172/x
3. Step 3: Cross multiply
   646,618x = 1,405,172 × 1,405,172
4. Step 4: Simplify right side
   646,618x = 1,974,508,349,584
5. Step 5: Solve for x
   x = 1,974,508,349,584/646,618
6. Step 6: Final answer
   x = 3,053,593.23