Finding the Third Proportional to 3,879,600 and 8,378,688

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,600 : 8,378,688 = 8,378,688 : x
2. Step 2: Convert to fraction form
   3,879,600/8,378,688 = 8,378,688/x
3. Step 3: Cross multiply
   3,879,600x = 8,378,688 × 8,378,688
4. Step 4: Simplify right side
   3,879,600x = 70,202,412,601,344
5. Step 5: Solve for x
   x = 70,202,412,601,344/3,879,600
6. Step 6: Final answer
   x = 18,095,270.80