Finding the Third Proportional to 389,515 and 582,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,515 : 582,715.50 = 582,715.50 : x
2. Step 2: Convert to fraction form
   389,515/582,715.50 = 582,715.50/x
3. Step 3: Cross multiply
   389,515x = 582,715.50 × 582,715.50
4. Step 4: Simplify right side
   389,515x = 339,557,353,940.25
5. Step 5: Solve for x
   x = 339,557,353,940.25/389,515
6. Step 6: Final answer
   x = 871,743.97