Finding the Third Proportional to 212,907 and 333,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,907 : 333,988.50 = 333,988.50 : x
2. Step 2: Convert to fraction form
   212,907/333,988.50 = 333,988.50/x
3. Step 3: Cross multiply
   212,907x = 333,988.50 × 333,988.50
4. Step 4: Simplify right side
   212,907x = 111,548,318,132.25
5. Step 5: Solve for x
   x = 111,548,318,132.25/212,907
6. Step 6: Final answer
   x = 523,929.78