Finding the Third Proportional to 6,558 and 12,900

Step by Step Solution

1. Step 1: Write the proportion equation
   6,558 : 12,900 = 12,900 : x
2. Step 2: Convert to fraction form
   6,558/12,900 = 12,900/x
3. Step 3: Cross multiply
   6,558x = 12,900 × 12,900
4. Step 4: Simplify right side
   6,558x = 166,410,000
5. Step 5: Solve for x
   x = 166,410,000/6,558
6. Step 6: Final answer
   x = 25,375.11