Finding the Third Proportional to 190,830 and 280,410

Step by Step Solution

1. Step 1: Write the proportion equation
   190,830 : 280,410 = 280,410 : x
2. Step 2: Convert to fraction form
   190,830/280,410 = 280,410/x
3. Step 3: Cross multiply
   190,830x = 280,410 × 280,410
4. Step 4: Simplify right side
   190,830x = 78,629,768,100
5. Step 5: Solve for x
   x = 78,629,768,100/190,830
6. Step 6: Final answer
   x = 412,040.92