Finding the Third Proportional to 190,809 and 280,379.25

Step by Step Solution

1. Step 1: Write the proportion equation
   190,809 : 280,379.25 = 280,379.25 : x
2. Step 2: Convert to fraction form
   190,809/280,379.25 = 280,379.25/x
3. Step 3: Cross multiply
   190,809x = 280,379.25 × 280,379.25
4. Step 4: Simplify right side
   190,809x = 78,612,523,830.56
5. Step 5: Solve for x
   x = 78,612,523,830.56/190,809
6. Step 6: Final answer
   x = 411,995.89