Finding the Third Proportional to 5,311 and 10,486

Step by Step Solution

1. Step 1: Write the proportion equation
   5,311 : 10,486 = 10,486 : x
2. Step 2: Convert to fraction form
   5,311/10,486 = 10,486/x
3. Step 3: Cross multiply
   5,311x = 10,486 × 10,486
4. Step 4: Simplify right side
   5,311x = 109,956,196
5. Step 5: Solve for x
   x = 109,956,196/5,311
6. Step 6: Final answer
   x = 20,703.48