Finding the Third Proportional to 3,909,072 and 8,409,120

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909,072 : 8,409,120 = 8,409,120 : x
2. Step 2: Convert to fraction form
   3,909,072/8,409,120 = 8,409,120/x
3. Step 3: Cross multiply
   3,909,072x = 8,409,120 × 8,409,120
4. Step 4: Simplify right side
   3,909,072x = 70,713,299,174,400
5. Step 5: Solve for x
   x = 70,713,299,174,400/3,909,072
6. Step 6: Final answer
   x = 18,089,536.13