Finding the Third Proportional to 5,978 and 12,899

Step by Step Solution

1. Step 1: Write the proportion equation
   5,978 : 12,899 = 12,899 : x
2. Step 2: Convert to fraction form
   5,978/12,899 = 12,899/x
3. Step 3: Cross multiply
   5,978x = 12,899 × 12,899
4. Step 4: Simplify right side
   5,978x = 166,384,201
5. Step 5: Solve for x
   x = 166,384,201/5,978
6. Step 6: Final answer
   x = 27,832.75