Finding the Third Proportional to 3,969,640 and 8,611,436

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,640 : 8,611,436 = 8,611,436 : x
2. Step 2: Convert to fraction form
   3,969,640/8,611,436 = 8,611,436/x
3. Step 3: Cross multiply
   3,969,640x = 8,611,436 × 8,611,436
4. Step 4: Simplify right side
   3,969,640x = 74,156,829,982,096
5. Step 5: Solve for x
   x = 74,156,829,982,096/3,969,640
6. Step 6: Final answer
   x = 18,680,996.26