Finding the Third Proportional to 1,978,421 and 4,263,994

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978,421 : 4,263,994 = 4,263,994 : x
2. Step 2: Convert to fraction form
   1,978,421/4,263,994 = 4,263,994/x
3. Step 3: Cross multiply
   1,978,421x = 4,263,994 × 4,263,994
4. Step 4: Simplify right side
   1,978,421x = 18,181,644,832,036
5. Step 5: Solve for x
   x = 18,181,644,832,036/1,978,421
6. Step 6: Final answer
   x = 9,189,977.68