Finding the Third Proportional to 155,455.50 and 321,981

Step by Step Solution

1. Step 1: Write the proportion equation
   155,455.50 : 321,981 = 321,981 : x
2. Step 2: Convert to fraction form
   155,455.50/321,981 = 321,981/x
3. Step 3: Cross multiply
   155,455.50x = 321,981 × 321,981
4. Step 4: Simplify right side
   155,455.50x = 103,671,764,361
5. Step 5: Solve for x
   x = 103,671,764,361/155,455.50
6. Step 6: Final answer
   x = 666,890.30