Finding the Third Proportional to 5,478 and 10,788

Step by Step Solution

1. Step 1: Write the proportion equation
   5,478 : 10,788 = 10,788 : x
2. Step 2: Convert to fraction form
   5,478/10,788 = 10,788/x
3. Step 3: Cross multiply
   5,478x = 10,788 × 10,788
4. Step 4: Simplify right side
   5,478x = 116,380,944
5. Step 5: Solve for x
   x = 116,380,944/5,478
6. Step 6: Final answer
   x = 21,245.15