Finding the Third Proportional to 1,405,966 and 2,128,670

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,966 : 2,128,670 = 2,128,670 : x
2. Step 2: Convert to fraction form
   1,405,966/2,128,670 = 2,128,670/x
3. Step 3: Cross multiply
   1,405,966x = 2,128,670 × 2,128,670
4. Step 4: Simplify right side
   1,405,966x = 4,531,235,968,900
5. Step 5: Solve for x
   x = 4,531,235,968,900/1,405,966
6. Step 6: Final answer
   x = 3,222,863.12