Finding the Third Proportional to 3,879,490 and 8,430,506

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,490 : 8,430,506 = 8,430,506 : x
2. Step 2: Convert to fraction form
   3,879,490/8,430,506 = 8,430,506/x
3. Step 3: Cross multiply
   3,879,490x = 8,430,506 × 8,430,506
4. Step 4: Simplify right side
   3,879,490x = 71,073,431,416,036
5. Step 5: Solve for x
   x = 71,073,431,416,036/3,879,490
6. Step 6: Final answer
   x = 18,320,302.78