Finding the Third Proportional to 129,519 and 280,759.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,519 : 280,759.50 = 280,759.50 : x
2. Step 2: Convert to fraction form
   129,519/280,759.50 = 280,759.50/x
3. Step 3: Cross multiply
   129,519x = 280,759.50 × 280,759.50
4. Step 4: Simplify right side
   129,519x = 78,825,896,840.25
5. Step 5: Solve for x
   x = 78,825,896,840.25/129,519
6. Step 6: Final answer
   x = 608,604.89