Finding the Third Proportional to 319,680 and 699,563.25

Step by Step Solution

1. Step 1: Write the proportion equation
   319,680 : 699,563.25 = 699,563.25 : x
2. Step 2: Convert to fraction form
   319,680/699,563.25 = 699,563.25/x
3. Step 3: Cross multiply
   319,680x = 699,563.25 × 699,563.25
4. Step 4: Simplify right side
   319,680x = 489,388,740,750.56
5. Step 5: Solve for x
   x = 489,388,740,750.56/319,680
6. Step 6: Final answer
   x = 1,530,870.69