Finding the Third Proportional to 878,647 and 1,918,406

Step by Step Solution

1. Step 1: Write the proportion equation
   878,647 : 1,918,406 = 1,918,406 : x
2. Step 2: Convert to fraction form
   878,647/1,918,406 = 1,918,406/x
3. Step 3: Cross multiply
   878,647x = 1,918,406 × 1,918,406
4. Step 4: Simplify right side
   878,647x = 3,680,281,580,836
5. Step 5: Solve for x
   x = 3,680,281,580,836/878,647
6. Step 6: Final answer
   x = 4,188,578.10