Finding the Third Proportional to 10,720 and 12,898

Step by Step Solution

1. Step 1: Write the proportion equation
   10,720 : 12,898 = 12,898 : x
2. Step 2: Convert to fraction form
   10,720/12,898 = 12,898/x
3. Step 3: Cross multiply
   10,720x = 12,898 × 12,898
4. Step 4: Simplify right side
   10,720x = 166,358,404
5. Step 5: Solve for x
   x = 166,358,404/10,720
6. Step 6: Final answer
   x = 15,518.51