Finding the Third Proportional to 331,760 and 500,390

Step by Step Solution

1. Step 1: Write the proportion equation
   331,760 : 500,390 = 500,390 : x
2. Step 2: Convert to fraction form
   331,760/500,390 = 500,390/x
3. Step 3: Cross multiply
   331,760x = 500,390 × 500,390
4. Step 4: Simplify right side
   331,760x = 250,390,152,100
5. Step 5: Solve for x
   x = 250,390,152,100/331,760
6. Step 6: Final answer
   x = 754,732.80