Finding the Third Proportional to 4,878 and 12,789

Step by Step Solution

1. Step 1: Write the proportion equation
   4,878 : 12,789 = 12,789 : x
2. Step 2: Convert to fraction form
   4,878/12,789 = 12,789/x
3. Step 3: Cross multiply
   4,878x = 12,789 × 12,789
4. Step 4: Simplify right side
   4,878x = 163,558,521
5. Step 5: Solve for x
   x = 163,558,521/4,878
6. Step 6: Final answer
   x = 33,529.83