Finding the Third Proportional to 300,948 and 399,501

Step by Step Solution

1. Step 1: Write the proportion equation
   300,948 : 399,501 = 399,501 : x
2. Step 2: Convert to fraction form
   300,948/399,501 = 399,501/x
3. Step 3: Cross multiply
   300,948x = 399,501 × 399,501
4. Step 4: Simplify right side
   300,948x = 159,601,049,001
5. Step 5: Solve for x
   x = 159,601,049,001/300,948
6. Step 6: Final answer
   x = 530,327.66