Finding the Third Proportional to 155,440.50 and 321,936

Step by Step Solution

1. Step 1: Write the proportion equation
   155,440.50 : 321,936 = 321,936 : x
2. Step 2: Convert to fraction form
   155,440.50/321,936 = 321,936/x
3. Step 3: Cross multiply
   155,440.50x = 321,936 × 321,936
4. Step 4: Simplify right side
   155,440.50x = 103,642,788,096
5. Step 5: Solve for x
   x = 103,642,788,096/155,440.50
6. Step 6: Final answer
   x = 666,768.24