Finding the Third Proportional to 3,879,316 and 8,430,116

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,316 : 8,430,116 = 8,430,116 : x
2. Step 2: Convert to fraction form
   3,879,316/8,430,116 = 8,430,116/x
3. Step 3: Cross multiply
   3,879,316x = 8,430,116 × 8,430,116
4. Step 4: Simplify right side
   3,879,316x = 71,066,855,773,456
5. Step 5: Solve for x
   x = 71,066,855,773,456/3,879,316
6. Step 6: Final answer
   x = 18,319,429.45