Finding the Third Proportional to 2,978,622 and 6,429,645

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978,622 : 6,429,645 = 6,429,645 : x
2. Step 2: Convert to fraction form
   2,978,622/6,429,645 = 6,429,645/x
3. Step 3: Cross multiply
   2,978,622x = 6,429,645 × 6,429,645
4. Step 4: Simplify right side
   2,978,622x = 41,340,334,826,025
5. Step 5: Solve for x
   x = 41,340,334,826,025/2,978,622
6. Step 6: Final answer
   x = 13,879,013.46