Finding the Third Proportional to 3,879,329 and 8,430,138

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,329 : 8,430,138 = 8,430,138 : x
2. Step 2: Convert to fraction form
   3,879,329/8,430,138 = 8,430,138/x
3. Step 3: Cross multiply
   3,879,329x = 8,430,138 × 8,430,138
4. Step 4: Simplify right side
   3,879,329x = 71,067,226,699,044
5. Step 5: Solve for x
   x = 71,067,226,699,044/3,879,329
6. Step 6: Final answer
   x = 18,319,463.68