Finding the Third Proportional to 178,436 and 387,976

Step by Step Solution

1. Step 1: Write the proportion equation
   178,436 : 387,976 = 387,976 : x
2. Step 2: Convert to fraction form
   178,436/387,976 = 387,976/x
3. Step 3: Cross multiply
   178,436x = 387,976 × 387,976
4. Step 4: Simplify right side
   178,436x = 150,525,376,576
5. Step 5: Solve for x
   x = 150,525,376,576/178,436
6. Step 6: Final answer
   x = 843,581.88