Finding the Fourth Proportional to 20,884.82, 28,805.52 and 13,618.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,884.82 : 28,805.52 = 13,618.52 : x
2. Step 2: Convert to fraction form
   20,884.82/28,805.52 = 13,618.52/x
3. Step 3: Cross multiply
   20,884.82x = 28,805.52 × 13,618.52
4. Step 4: Simplify right side
   20,884.82x = 392,288,524.79
5. Step 5: Solve for x
   x = 392,288,524.79/20,884.82
6. Step 6: Final answer
   x = 18,783.42