Finding the Third Proportional to 4,597,874 and 9,991,636

Step by Step Solution

1. Step 1: Write the proportion equation
   4,597,874 : 9,991,636 = 9,991,636 : x
2. Step 2: Convert to fraction form
   4,597,874/9,991,636 = 9,991,636/x
3. Step 3: Cross multiply
   4,597,874x = 9,991,636 × 9,991,636
4. Step 4: Simplify right side
   4,597,874x = 99,832,789,956,496
5. Step 5: Solve for x
   x = 99,832,789,956,496/4,597,874
6. Step 6: Final answer
   x = 21,712,815.52