Finding the Third Proportional to 217,916 and 333,210

Step by Step Solution

1. Step 1: Write the proportion equation
   217,916 : 333,210 = 333,210 : x
2. Step 2: Convert to fraction form
   217,916/333,210 = 333,210/x
3. Step 3: Cross multiply
   217,916x = 333,210 × 333,210
4. Step 4: Simplify right side
   217,916x = 111,028,904,100
5. Step 5: Solve for x
   x = 111,028,904,100/217,916
6. Step 6: Final answer
   x = 509,503.22