Finding the Third Proportional to 190,672 and 280,500

Step by Step Solution

1. Step 1: Write the proportion equation
   190,672 : 280,500 = 280,500 : x
2. Step 2: Convert to fraction form
   190,672/280,500 = 280,500/x
3. Step 3: Cross multiply
   190,672x = 280,500 × 280,500
4. Step 4: Simplify right side
   190,672x = 78,680,250,000
5. Step 5: Solve for x
   x = 78,680,250,000/190,672
6. Step 6: Final answer
   x = 412,647.11