Finding the Third Proportional to 321,157 and 699,510

Step by Step Solution

1. Step 1: Write the proportion equation
   321,157 : 699,510 = 699,510 : x
2. Step 2: Convert to fraction form
   321,157/699,510 = 699,510/x
3. Step 3: Cross multiply
   321,157x = 699,510 × 699,510
4. Step 4: Simplify right side
   321,157x = 489,314,240,100
5. Step 5: Solve for x
   x = 489,314,240,100/321,157
6. Step 6: Final answer
   x = 1,523,598.24