Finding the Third Proportional to 200,939.25 and 280,942.88

Step by Step Solution

1. Step 1: Write the proportion equation
   200,939.25 : 280,942.88 = 280,942.88 : x
2. Step 2: Convert to fraction form
   200,939.25/280,942.88 = 280,942.88/x
3. Step 3: Cross multiply
   200,939.25x = 280,942.88 × 280,942.88
4. Step 4: Simplify right side
   200,939.25x = 78,928,899,013.27
5. Step 5: Solve for x
   x = 78,928,899,013.27/200,939.25
6. Step 6: Final answer
   x = 392,799.81