Finding the Third Proportional to 3,908,139 and 8,611,401

Step by Step Solution

1. Step 1: Write the proportion equation
   3,908,139 : 8,611,401 = 8,611,401 : x
2. Step 2: Convert to fraction form
   3,908,139/8,611,401 = 8,611,401/x
3. Step 3: Cross multiply
   3,908,139x = 8,611,401 × 8,611,401
4. Step 4: Simplify right side
   3,908,139x = 74,156,227,182,801
5. Step 5: Solve for x
   x = 74,156,227,182,801/3,908,139
6. Step 6: Final answer
   x = 18,974,818.24