Finding the Third Proportional to 146,989.50 and 321,990

Step by Step Solution

1. Step 1: Write the proportion equation
   146,989.50 : 321,990 = 321,990 : x
2. Step 2: Convert to fraction form
   146,989.50/321,990 = 321,990/x
3. Step 3: Cross multiply
   146,989.50x = 321,990 × 321,990
4. Step 4: Simplify right side
   146,989.50x = 103,677,560,100
5. Step 5: Solve for x
   x = 103,677,560,100/146,989.50
6. Step 6: Final answer
   x = 705,339.91