Finding the Third Proportional to 7,139 and 10,979

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139 : 10,979 = 10,979 : x
2. Step 2: Convert to fraction form
   7,139/10,979 = 10,979/x
3. Step 3: Cross multiply
   7,139x = 10,979 × 10,979
4. Step 4: Simplify right side
   7,139x = 120,538,441
5. Step 5: Solve for x
   x = 120,538,441/7,139
6. Step 6: Final answer
   x = 16,884.50