Finding the Third Proportional to 300,954 and 399,510

Step by Step Solution

1. Step 1: Write the proportion equation
   300,954 : 399,510 = 399,510 : x
2. Step 2: Convert to fraction form
   300,954/399,510 = 399,510/x
3. Step 3: Cross multiply
   300,954x = 399,510 × 399,510
4. Step 4: Simplify right side
   300,954x = 159,608,240,100
5. Step 5: Solve for x
   x = 159,608,240,100/300,954
6. Step 6: Final answer
   x = 530,340.98