Finding the Third Proportional to 30,819.50 and 65,610.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,819.50 : 65,610.50 = 65,610.50 : x
2. Step 2: Convert to fraction form
   30,819.50/65,610.50 = 65,610.50/x
3. Step 3: Cross multiply
   30,819.50x = 65,610.50 × 65,610.50
4. Step 4: Simplify right side
   30,819.50x = 4,304,737,710.25
5. Step 5: Solve for x
   x = 4,304,737,710.25/30,819.50
6. Step 6: Final answer
   x = 139,675.78