Finding the Third Proportional to 5,409,478 and 8,424,408

Step by Step Solution

1. Step 1: Write the proportion equation
   5,409,478 : 8,424,408 = 8,424,408 : x
2. Step 2: Convert to fraction form
   5,409,478/8,424,408 = 8,424,408/x
3. Step 3: Cross multiply
   5,409,478x = 8,424,408 × 8,424,408
4. Step 4: Simplify right side
   5,409,478x = 70,970,650,150,464
5. Step 5: Solve for x
   x = 70,970,650,150,464/5,409,478
6. Step 6: Final answer
   x = 13,119,685.51