Finding the Third Proportional to 12,216 and 18,320.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216 : 18,320.25 = 18,320.25 : x
2. Step 2: Convert to fraction form
   12,216/18,320.25 = 18,320.25/x
3. Step 3: Cross multiply
   12,216x = 18,320.25 × 18,320.25
4. Step 4: Simplify right side
   12,216x = 335,631,560.06
5. Step 5: Solve for x
   x = 335,631,560.06/12,216
6. Step 6: Final answer
   x = 27,474.75