Finding the Third Proportional to 30,979 and 67,888

Step by Step Solution

1. Step 1: Write the proportion equation
   30,979 : 67,888 = 67,888 : x
2. Step 2: Convert to fraction form
   30,979/67,888 = 67,888/x
3. Step 3: Cross multiply
   30,979x = 67,888 × 67,888
4. Step 4: Simplify right side
   30,979x = 4,608,780,544
5. Step 5: Solve for x
   x = 4,608,780,544/30,979
6. Step 6: Final answer
   x = 148,771.12