Finding the Third Proportional to 4,597,878 and 9,991,644

Step by Step Solution

1. Step 1: Write the proportion equation
   4,597,878 : 9,991,644 = 9,991,644 : x
2. Step 2: Convert to fraction form
   4,597,878/9,991,644 = 9,991,644/x
3. Step 3: Cross multiply
   4,597,878x = 9,991,644 × 9,991,644
4. Step 4: Simplify right side
   4,597,878x = 99,832,949,822,736
5. Step 5: Solve for x
   x = 99,832,949,822,736/4,597,878
6. Step 6: Final answer
   x = 21,712,831.40