Finding the Third Proportional to 259,695 and 388,510.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,695 : 388,510.50 = 388,510.50 : x
2. Step 2: Convert to fraction form
   259,695/388,510.50 = 388,510.50/x
3. Step 3: Cross multiply
   259,695x = 388,510.50 × 388,510.50
4. Step 4: Simplify right side
   259,695x = 150,940,408,610.25
5. Step 5: Solve for x
   x = 150,940,408,610.25/259,695
6. Step 6: Final answer
   x = 581,221.85