Finding the Third Proportional to 3,986,840 and 8,540,144

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986,840 : 8,540,144 = 8,540,144 : x
2. Step 2: Convert to fraction form
   3,986,840/8,540,144 = 8,540,144/x
3. Step 3: Cross multiply
   3,986,840x = 8,540,144 × 8,540,144
4. Step 4: Simplify right side
   3,986,840x = 72,934,059,540,736
5. Step 5: Solve for x
   x = 72,934,059,540,736/3,986,840
6. Step 6: Final answer
   x = 18,293,701.16