Finding the Third Proportional to 145,586 and 315,940

Step by Step Solution

1. Step 1: Write the proportion equation
   145,586 : 315,940 = 315,940 : x
2. Step 2: Convert to fraction form
   145,586/315,940 = 315,940/x
3. Step 3: Cross multiply
   145,586x = 315,940 × 315,940
4. Step 4: Simplify right side
   145,586x = 99,818,083,600
5. Step 5: Solve for x
   x = 99,818,083,600/145,586
6. Step 6: Final answer
   x = 685,629.69