Finding the Third Proportional to 4,796,878 and 9,786,440

Step by Step Solution

1. Step 1: Write the proportion equation
   4,796,878 : 9,786,440 = 9,786,440 : x
2. Step 2: Convert to fraction form
   4,796,878/9,786,440 = 9,786,440/x
3. Step 3: Cross multiply
   4,796,878x = 9,786,440 × 9,786,440
4. Step 4: Simplify right side
   4,796,878x = 95,774,407,873,600
5. Step 5: Solve for x
   x = 95,774,407,873,600/4,796,878
6. Step 6: Final answer
   x = 19,965,987.85