Finding the Third Proportional to 8,242,405 and 12,608,390

Step by Step Solution

1. Step 1: Write the proportion equation
   8,242,405 : 12,608,390 = 12,608,390 : x
2. Step 2: Convert to fraction form
   8,242,405/12,608,390 = 12,608,390/x
3. Step 3: Cross multiply
   8,242,405x = 12,608,390 × 12,608,390
4. Step 4: Simplify right side
   8,242,405x = 158,971,498,392,100
5. Step 5: Solve for x
   x = 158,971,498,392,100/8,242,405
6. Step 6: Final answer
   x = 19,287,028.29