Finding the Third Proportional to 1,921,644 and 4,448,139

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921,644 : 4,448,139 = 4,448,139 : x
2. Step 2: Convert to fraction form
   1,921,644/4,448,139 = 4,448,139/x
3. Step 3: Cross multiply
   1,921,644x = 4,448,139 × 4,448,139
4. Step 4: Simplify right side
   1,921,644x = 19,785,940,563,321
5. Step 5: Solve for x
   x = 19,785,940,563,321/1,921,644
6. Step 6: Final answer
   x = 10,296,361.12