Finding the Third Proportional to 3,909,076 and 8,409,128

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909,076 : 8,409,128 = 8,409,128 : x
2. Step 2: Convert to fraction form
   3,909,076/8,409,128 = 8,409,128/x
3. Step 3: Cross multiply
   3,909,076x = 8,409,128 × 8,409,128
4. Step 4: Simplify right side
   3,909,076x = 70,713,433,720,384
5. Step 5: Solve for x
   x = 70,713,433,720,384/3,909,076
6. Step 6: Final answer
   x = 18,089,552.04