Finding the Fourth Proportional to 20,003.78, 27,589.47 and 18,662.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,003.78 : 27,589.47 = 18,662.42 : x
2. Step 2: Convert to fraction form
   20,003.78/27,589.47 = 18,662.42/x
3. Step 3: Cross multiply
   20,003.78x = 27,589.47 × 18,662.42
4. Step 4: Simplify right side
   20,003.78x = 514,886,276.72
5. Step 5: Solve for x
   x = 514,886,276.72/20,003.78
6. Step 6: Final answer
   x = 25,739.45