Finding the Third Proportional to 321,985.50 and 699,324

Step by Step Solution

1. Step 1: Write the proportion equation
   321,985.50 : 699,324 = 699,324 : x
2. Step 2: Convert to fraction form
   321,985.50/699,324 = 699,324/x
3. Step 3: Cross multiply
   321,985.50x = 699,324 × 699,324
4. Step 4: Simplify right side
   321,985.50x = 489,054,056,976
5. Step 5: Solve for x
   x = 489,054,056,976/321,985.50
6. Step 6: Final answer
   x = 1,518,869.82