Finding the Third Proportional to 129,618 and 269,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,618 : 269,581.50 = 269,581.50 : x
2. Step 2: Convert to fraction form
   129,618/269,581.50 = 269,581.50/x
3. Step 3: Cross multiply
   129,618x = 269,581.50 × 269,581.50
4. Step 4: Simplify right side
   129,618x = 72,674,185,142.25
5. Step 5: Solve for x
   x = 72,674,185,142.25/129,618
6. Step 6: Final answer
   x = 560,679.73