Finding the Third Proportional to 145,961.25 and 315,912

Step by Step Solution

1. Step 1: Write the proportion equation
   145,961.25 : 315,912 = 315,912 : x
2. Step 2: Convert to fraction form
   145,961.25/315,912 = 315,912/x
3. Step 3: Cross multiply
   145,961.25x = 315,912 × 315,912
4. Step 4: Simplify right side
   145,961.25x = 99,800,391,744
5. Step 5: Solve for x
   x = 99,800,391,744/145,961.25
6. Step 6: Final answer
   x = 683,745.80