Finding the Third Proportional to 8,243.25 and 12,210.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,243.25 : 12,210.75 = 12,210.75 : x
2. Step 2: Convert to fraction form
   8,243.25/12,210.75 = 12,210.75/x
3. Step 3: Cross multiply
   8,243.25x = 12,210.75 × 12,210.75
4. Step 4: Simplify right side
   8,243.25x = 149,102,415.56
5. Step 5: Solve for x
   x = 149,102,415.56/8,243.25
6. Step 6: Final answer
   x = 18,087.82