Finding the Third Proportional to 1,387,998 and 3,213,028

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,998 : 3,213,028 = 3,213,028 : x
2. Step 2: Convert to fraction form
   1,387,998/3,213,028 = 3,213,028/x
3. Step 3: Cross multiply
   1,387,998x = 3,213,028 × 3,213,028
4. Step 4: Simplify right side
   1,387,998x = 10,323,548,928,784
5. Step 5: Solve for x
   x = 10,323,548,928,784/1,387,998
6. Step 6: Final answer
   x = 7,437,726.08