Finding the Fourth Proportional to 28,518.82, 42,789.18 and 20,093.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,518.82 : 42,789.18 = 20,093.42 : x
2. Step 2: Convert to fraction form
   28,518.82/42,789.18 = 20,093.42/x
3. Step 3: Cross multiply
   28,518.82x = 42,789.18 × 20,093.42
4. Step 4: Simplify right side
   28,518.82x = 859,780,965.20
5. Step 5: Solve for x
   x = 859,780,965.20/28,518.82
6. Step 6: Final answer
   x = 30,147.85