Finding the Third Proportional to 3,909,120 and 8,409,216

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909,120 : 8,409,216 = 8,409,216 : x
2. Step 2: Convert to fraction form
   3,909,120/8,409,216 = 8,409,216/x
3. Step 3: Cross multiply
   3,909,120x = 8,409,216 × 8,409,216
4. Step 4: Simplify right side
   3,909,120x = 70,714,913,734,656
5. Step 5: Solve for x
   x = 70,714,913,734,656/3,909,120
6. Step 6: Final answer
   x = 18,089,727.03