Finding the Third Proportional to 199,720 and 280,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   199,720 : 280,919.50 = 280,919.50 : x
2. Step 2: Convert to fraction form
   199,720/280,919.50 = 280,919.50/x
3. Step 3: Cross multiply
   199,720x = 280,919.50 × 280,919.50
4. Step 4: Simplify right side
   199,720x = 78,915,765,480.25
5. Step 5: Solve for x
   x = 78,915,765,480.25/199,720
6. Step 6: Final answer
   x = 395,132.01