Finding the Third Proportional to 18,138.09 and 27,728.16

Step by Step Solution

1. Step 1: Write the proportion equation
   18,138.09 : 27,728.16 = 27,728.16 : x
2. Step 2: Convert to fraction form
   18,138.09/27,728.16 = 27,728.16/x
3. Step 3: Cross multiply
   18,138.09x = 27,728.16 × 27,728.16
4. Step 4: Simplify right side
   18,138.09x = 768,850,649.02
5. Step 5: Solve for x
   x = 768,850,649.02/18,138.09
6. Step 6: Final answer
   x = 42,388.72