Finding the Third Proportional to 155,458.50 and 321,969

Step by Step Solution

1. Step 1: Write the proportion equation
   155,458.50 : 321,969 = 321,969 : x
2. Step 2: Convert to fraction form
   155,458.50/321,969 = 321,969/x
3. Step 3: Cross multiply
   155,458.50x = 321,969 × 321,969
4. Step 4: Simplify right side
   155,458.50x = 103,664,036,961
5. Step 5: Solve for x
   x = 103,664,036,961/155,458.50
6. Step 6: Final answer
   x = 666,827.72