Finding the Third Proportional to 145,998 and 315,300

Step by Step Solution

1. Step 1: Write the proportion equation
   145,998 : 315,300 = 315,300 : x
2. Step 2: Convert to fraction form
   145,998/315,300 = 315,300/x
3. Step 3: Cross multiply
   145,998x = 315,300 × 315,300
4. Step 4: Simplify right side
   145,998x = 99,414,090,000
5. Step 5: Solve for x
   x = 99,414,090,000/145,998
6. Step 6: Final answer
   x = 680,927.75