Finding the Third Proportional to 3,986,838 and 8,540,140

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986,838 : 8,540,140 = 8,540,140 : x
2. Step 2: Convert to fraction form
   3,986,838/8,540,140 = 8,540,140/x
3. Step 3: Cross multiply
   3,986,838x = 8,540,140 × 8,540,140
4. Step 4: Simplify right side
   3,986,838x = 72,933,991,219,600
5. Step 5: Solve for x
   x = 72,933,991,219,600/3,986,838
6. Step 6: Final answer
   x = 18,293,693.20