Finding the Third Proportional to 59,578 and 87,980

Step by Step Solution

1. Step 1: Write the proportion equation
   59,578 : 87,980 = 87,980 : x
2. Step 2: Convert to fraction form
   59,578/87,980 = 87,980/x
3. Step 3: Cross multiply
   59,578x = 87,980 × 87,980
4. Step 4: Simplify right side
   59,578x = 7,740,480,400
5. Step 5: Solve for x
   x = 7,740,480,400/59,578
6. Step 6: Final answer
   x = 129,921.79