Finding the Third Proportional to 319,981.50 and 687,449

Step by Step Solution

1. Step 1: Write the proportion equation
   319,981.50 : 687,449 = 687,449 : x
2. Step 2: Convert to fraction form
   319,981.50/687,449 = 687,449/x
3. Step 3: Cross multiply
   319,981.50x = 687,449 × 687,449
4. Step 4: Simplify right side
   319,981.50x = 472,586,127,601
5. Step 5: Solve for x
   x = 472,586,127,601/319,981.50
6. Step 6: Final answer
   x = 1,476,917.03