Finding the Third Proportional to 12,172.50 and 18,390.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,172.50 : 18,390.38 = 18,390.38 : x
2. Step 2: Convert to fraction form
   12,172.50/18,390.38 = 18,390.38/x
3. Step 3: Cross multiply
   12,172.50x = 18,390.38 × 18,390.38
4. Step 4: Simplify right side
   12,172.50x = 338,205,892.64
5. Step 5: Solve for x
   x = 338,205,892.64/12,172.50
6. Step 6: Final answer
   x = 27,784.42