Finding the Third Proportional to 6,828 and 10,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,828 : 10,856.50 = 10,856.50 : x
2. Step 2: Convert to fraction form
   6,828/10,856.50 = 10,856.50/x
3. Step 3: Cross multiply
   6,828x = 10,856.50 × 10,856.50
4. Step 4: Simplify right side
   6,828x = 117,863,592.25
5. Step 5: Solve for x
   x = 117,863,592.25/6,828
6. Step 6: Final answer
   x = 17,261.80