Finding the Fourth Proportional to 30,843.82, 42,519.90 and 20,215

Step by Step Solution

1. Step 1: Write the proportion equation
   30,843.82 : 42,519.90 = 20,215 : x
2. Step 2: Convert to fraction form
   30,843.82/42,519.90 = 20,215/x
3. Step 3: Cross multiply
   30,843.82x = 42,519.90 × 20,215
4. Step 4: Simplify right side
   30,843.82x = 859,539,778.50
5. Step 5: Solve for x
   x = 859,539,778.50/30,843.82
6. Step 6: Final answer
   x = 27,867.49