Finding the Third Proportional to 878,648 and 1,918,408

Step by Step Solution

1. Step 1: Write the proportion equation
   878,648 : 1,918,408 = 1,918,408 : x
2. Step 2: Convert to fraction form
   878,648/1,918,408 = 1,918,408/x
3. Step 3: Cross multiply
   878,648x = 1,918,408 × 1,918,408
4. Step 4: Simplify right side
   878,648x = 3,680,289,254,464
5. Step 5: Solve for x
   x = 3,680,289,254,464/878,648
6. Step 6: Final answer
   x = 4,188,582.07