Finding the Third Proportional to 199,790 and 281,040

Step by Step Solution

1. Step 1: Write the proportion equation
   199,790 : 281,040 = 281,040 : x
2. Step 2: Convert to fraction form
   199,790/281,040 = 281,040/x
3. Step 3: Cross multiply
   199,790x = 281,040 × 281,040
4. Step 4: Simplify right side
   199,790x = 78,983,481,600
5. Step 5: Solve for x
   x = 78,983,481,600/199,790
6. Step 6: Final answer
   x = 395,332.51