Finding the Third Proportional to 1,218,912 and 1,906,128

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,912 : 1,906,128 = 1,906,128 : x
2. Step 2: Convert to fraction form
   1,218,912/1,906,128 = 1,906,128/x
3. Step 3: Cross multiply
   1,218,912x = 1,906,128 × 1,906,128
4. Step 4: Simplify right side
   1,218,912x = 3,633,323,952,384
5. Step 5: Solve for x
   x = 3,633,323,952,384/1,218,912
6. Step 6: Final answer
   x = 2,980,792.67