Finding the Third Proportional to 275,571 and 390,040.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,571 : 390,040.50 = 390,040.50 : x
2. Step 2: Convert to fraction form
   275,571/390,040.50 = 390,040.50/x
3. Step 3: Cross multiply
   275,571x = 390,040.50 × 390,040.50
4. Step 4: Simplify right side
   275,571x = 152,131,591,640.25
5. Step 5: Solve for x
   x = 152,131,591,640.25/275,571
6. Step 6: Final answer
   x = 552,059.51