Finding the Third Proportional to 8,458,608 and 12,690,504

Step by Step Solution

1. Step 1: Write the proportion equation
   8,458,608 : 12,690,504 = 12,690,504 : x
2. Step 2: Convert to fraction form
   8,458,608/12,690,504 = 12,690,504/x
3. Step 3: Cross multiply
   8,458,608x = 12,690,504 × 12,690,504
4. Step 4: Simplify right side
   8,458,608x = 161,048,891,774,016
5. Step 5: Solve for x
   x = 161,048,891,774,016/8,458,608
6. Step 6: Final answer
   x = 19,039,644.79