Finding the Third Proportional to 30,979.13 and 67,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,979.13 : 67,648.50 = 67,648.50 : x
2. Step 2: Convert to fraction form
   30,979.13/67,648.50 = 67,648.50/x
3. Step 3: Cross multiply
   30,979.13x = 67,648.50 × 67,648.50
4. Step 4: Simplify right side
   30,979.13x = 4,576,319,552.25
5. Step 5: Solve for x
   x = 4,576,319,552.25/30,979.13
6. Step 6: Final answer
   x = 147,722.69