Finding the Third Proportional to 129,190.50 and 274,018.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,190.50 : 274,018.50 = 274,018.50 : x
2. Step 2: Convert to fraction form
   129,190.50/274,018.50 = 274,018.50/x
3. Step 3: Cross multiply
   129,190.50x = 274,018.50 × 274,018.50
4. Step 4: Simplify right side
   129,190.50x = 75,086,138,342.25
5. Step 5: Solve for x
   x = 75,086,138,342.25/129,190.50
6. Step 6: Final answer
   x = 581,204.80