Finding the Third Proportional to 212,908 and 333,990

Step by Step Solution

1. Step 1: Write the proportion equation
   212,908 : 333,990 = 333,990 : x
2. Step 2: Convert to fraction form
   212,908/333,990 = 333,990/x
3. Step 3: Cross multiply
   212,908x = 333,990 × 333,990
4. Step 4: Simplify right side
   212,908x = 111,549,320,100
5. Step 5: Solve for x
   x = 111,549,320,100/212,908
6. Step 6: Final answer
   x = 523,932.03