Finding the Third Proportional to 216,918 and 333,623.25

Step by Step Solution

1. Step 1: Write the proportion equation
   216,918 : 333,623.25 = 333,623.25 : x
2. Step 2: Convert to fraction form
   216,918/333,623.25 = 333,623.25/x
3. Step 3: Cross multiply
   216,918x = 333,623.25 × 333,623.25
4. Step 4: Simplify right side
   216,918x = 111,304,472,940.56
5. Step 5: Solve for x
   x = 111,304,472,940.56/216,918
6. Step 6: Final answer
   x = 513,117.74