Finding the Third Proportional to 12,210.75 and 18,418.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210.75 : 18,418.50 = 18,418.50 : x
2. Step 2: Convert to fraction form
   12,210.75/18,418.50 = 18,418.50/x
3. Step 3: Cross multiply
   12,210.75x = 18,418.50 × 18,418.50
4. Step 4: Simplify right side
   12,210.75x = 339,241,142.25
5. Step 5: Solve for x
   x = 339,241,142.25/12,210.75
6. Step 6: Final answer
   x = 27,782.17