Finding the Third Proportional to 190,622 and 280,386

Step by Step Solution

1. Step 1: Write the proportion equation
   190,622 : 280,386 = 280,386 : x
2. Step 2: Convert to fraction form
   190,622/280,386 = 280,386/x
3. Step 3: Cross multiply
   190,622x = 280,386 × 280,386
4. Step 4: Simplify right side
   190,622x = 78,616,308,996
5. Step 5: Solve for x
   x = 78,616,308,996/190,622
6. Step 6: Final answer
   x = 412,419.91