Finding the Third Proportional to 4,012,486 and 8,679,434

Step by Step Solution

1. Step 1: Write the proportion equation
   4,012,486 : 8,679,434 = 8,679,434 : x
2. Step 2: Convert to fraction form
   4,012,486/8,679,434 = 8,679,434/x
3. Step 3: Cross multiply
   4,012,486x = 8,679,434 × 8,679,434
4. Step 4: Simplify right side
   4,012,486x = 75,332,574,560,356
5. Step 5: Solve for x
   x = 75,332,574,560,356/4,012,486
6. Step 6: Final answer
   x = 18,774,538.92