Finding the Third Proportional to 1,780,909 and 4,199,878

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780,909 : 4,199,878 = 4,199,878 : x
2. Step 2: Convert to fraction form
   1,780,909/4,199,878 = 4,199,878/x
3. Step 3: Cross multiply
   1,780,909x = 4,199,878 × 4,199,878
4. Step 4: Simplify right side
   1,780,909x = 17,638,975,214,884
5. Step 5: Solve for x
   x = 17,638,975,214,884/1,780,909
6. Step 6: Final answer
   x = 9,904,478.68