Finding the Third Proportional to 315,328.50 and 489,576

Step by Step Solution

1. Step 1: Write the proportion equation
   315,328.50 : 489,576 = 489,576 : x
2. Step 2: Convert to fraction form
   315,328.50/489,576 = 489,576/x
3. Step 3: Cross multiply
   315,328.50x = 489,576 × 489,576
4. Step 4: Simplify right side
   315,328.50x = 239,684,659,776
5. Step 5: Solve for x
   x = 239,684,659,776/315,328.50
6. Step 6: Final answer
   x = 760,110.99