Finding the Third Proportional to 1,405,948 and 2,128,639

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,948 : 2,128,639 = 2,128,639 : x
2. Step 2: Convert to fraction form
   1,405,948/2,128,639 = 2,128,639/x
3. Step 3: Cross multiply
   1,405,948x = 2,128,639 × 2,128,639
4. Step 4: Simplify right side
   1,405,948x = 4,531,103,992,321
5. Step 5: Solve for x
   x = 4,531,103,992,321/1,405,948
6. Step 6: Final answer
   x = 3,222,810.51