Finding the Third Proportional to 1,978,419 and 4,263,990

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978,419 : 4,263,990 = 4,263,990 : x
2. Step 2: Convert to fraction form
   1,978,419/4,263,990 = 4,263,990/x
3. Step 3: Cross multiply
   1,978,419x = 4,263,990 × 4,263,990
4. Step 4: Simplify right side
   1,978,419x = 18,181,610,720,100
5. Step 5: Solve for x
   x = 18,181,610,720,100/1,978,419
6. Step 6: Final answer
   x = 9,189,969.73