Finding the Third Proportional to 210,805 and 308,320

Step by Step Solution

1. Step 1: Write the proportion equation
   210,805 : 308,320 = 308,320 : x
2. Step 2: Convert to fraction form
   210,805/308,320 = 308,320/x
3. Step 3: Cross multiply
   210,805x = 308,320 × 308,320
4. Step 4: Simplify right side
   210,805x = 95,061,222,400
5. Step 5: Solve for x
   x = 95,061,222,400/210,805
6. Step 6: Final answer
   x = 450,943.87