Finding the Third Proportional to 149,855.25 and 321,086.25

Step by Step Solution

1. Step 1: Write the proportion equation
   149,855.25 : 321,086.25 = 321,086.25 : x
2. Step 2: Convert to fraction form
   149,855.25/321,086.25 = 321,086.25/x
3. Step 3: Cross multiply
   149,855.25x = 321,086.25 × 321,086.25
4. Step 4: Simplify right side
   149,855.25x = 103,096,379,939.06
5. Step 5: Solve for x
   x = 103,096,379,939.06/149,855.25
6. Step 6: Final answer
   x = 687,973.09