Finding the Third Proportional to 59,721 and 128,782.50

Step by Step Solution

1. Step 1: Write the proportion equation
   59,721 : 128,782.50 = 128,782.50 : x
2. Step 2: Convert to fraction form
   59,721/128,782.50 = 128,782.50/x
3. Step 3: Cross multiply
   59,721x = 128,782.50 × 128,782.50
4. Step 4: Simplify right side
   59,721x = 16,584,932,306.25
5. Step 5: Solve for x
   x = 16,584,932,306.25/59,721
6. Step 6: Final answer
   x = 277,706.88