Finding the Third Proportional to 215,804 and 315,885

Step by Step Solution

1. Step 1: Write the proportion equation
   215,804 : 315,885 = 315,885 : x
2. Step 2: Convert to fraction form
   215,804/315,885 = 315,885/x
3. Step 3: Cross multiply
   215,804x = 315,885 × 315,885
4. Step 4: Simplify right side
   215,804x = 99,783,333,225
5. Step 5: Solve for x
   x = 99,783,333,225/215,804
6. Step 6: Final answer
   x = 462,379.44