Finding the Third Proportional to 139,923 and 299,790

Step by Step Solution

1. Step 1: Write the proportion equation
   139,923 : 299,790 = 299,790 : x
2. Step 2: Convert to fraction form
   139,923/299,790 = 299,790/x
3. Step 3: Cross multiply
   139,923x = 299,790 × 299,790
4. Step 4: Simplify right side
   139,923x = 89,874,044,100
5. Step 5: Solve for x
   x = 89,874,044,100/139,923
6. Step 6: Final answer
   x = 642,310.73