Finding the Third Proportional to 187,018.50 and 280,455

Step by Step Solution

1. Step 1: Write the proportion equation
   187,018.50 : 280,455 = 280,455 : x
2. Step 2: Convert to fraction form
   187,018.50/280,455 = 280,455/x
3. Step 3: Cross multiply
   187,018.50x = 280,455 × 280,455
4. Step 4: Simplify right side
   187,018.50x = 78,655,007,025
5. Step 5: Solve for x
   x = 78,655,007,025/187,018.50
6. Step 6: Final answer
   x = 420,573.40