Finding the Third Proportional to 5,242 and 10,656

Step by Step Solution

1. Step 1: Write the proportion equation
   5,242 : 10,656 = 10,656 : x
2. Step 2: Convert to fraction form
   5,242/10,656 = 10,656/x
3. Step 3: Cross multiply
   5,242x = 10,656 × 10,656
4. Step 4: Simplify right side
   5,242x = 113,550,336
5. Step 5: Solve for x
   x = 113,550,336/5,242
6. Step 6: Final answer
   x = 21,661.64