Finding the Third Proportional to 3,878,658 and 8,440,956

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878,658 : 8,440,956 = 8,440,956 : x
2. Step 2: Convert to fraction form
   3,878,658/8,440,956 = 8,440,956/x
3. Step 3: Cross multiply
   3,878,658x = 8,440,956 × 8,440,956
4. Step 4: Simplify right side
   3,878,658x = 71,249,738,193,936
5. Step 5: Solve for x
   x = 71,249,738,193,936/3,878,658
6. Step 6: Final answer
   x = 18,369,688.23