Finding the Third Proportional to 217,869 and 300,018

Step by Step Solution

1. Step 1: Write the proportion equation
   217,869 : 300,018 = 300,018 : x
2. Step 2: Convert to fraction form
   217,869/300,018 = 300,018/x
3. Step 3: Cross multiply
   217,869x = 300,018 × 300,018
4. Step 4: Simplify right side
   217,869x = 90,010,800,324
5. Step 5: Solve for x
   x = 90,010,800,324/217,869
6. Step 6: Final answer
   x = 413,141.84