Finding the Third Proportional to 4,869 and 10,155

Step by Step Solution

1. Step 1: Write the proportion equation
   4,869 : 10,155 = 10,155 : x
2. Step 2: Convert to fraction form
   4,869/10,155 = 10,155/x
3. Step 3: Cross multiply
   4,869x = 10,155 × 10,155
4. Step 4: Simplify right side
   4,869x = 103,124,025
5. Step 5: Solve for x
   x = 103,124,025/4,869
6. Step 6: Final answer
   x = 21,179.71