Finding the Third Proportional to 3,867,786 and 8,378,388

Step by Step Solution

1. Step 1: Write the proportion equation
   3,867,786 : 8,378,388 = 8,378,388 : x
2. Step 2: Convert to fraction form
   3,867,786/8,378,388 = 8,378,388/x
3. Step 3: Cross multiply
   3,867,786x = 8,378,388 × 8,378,388
4. Step 4: Simplify right side
   3,867,786x = 70,197,385,478,544
5. Step 5: Solve for x
   x = 70,197,385,478,544/3,867,786
6. Step 6: Final answer
   x = 18,149,242.35