Finding the Third Proportional to 10,870 and 11,878

Step by Step Solution

1. Step 1: Write the proportion equation
   10,870 : 11,878 = 11,878 : x
2. Step 2: Convert to fraction form
   10,870/11,878 = 11,878/x
3. Step 3: Cross multiply
   10,870x = 11,878 × 11,878
4. Step 4: Simplify right side
   10,870x = 141,086,884
5. Step 5: Solve for x
   x = 141,086,884/10,870
6. Step 6: Final answer
   x = 12,979.47