Finding the Fourth Proportional to 30,949.34, 42,745.25 and 20,860.38

Step by Step Solution

1. Step 1: Write the proportion equation
   30,949.34 : 42,745.25 = 20,860.38 : x
2. Step 2: Convert to fraction form
   30,949.34/42,745.25 = 20,860.38/x
3. Step 3: Cross multiply
   30,949.34x = 42,745.25 × 20,860.38
4. Step 4: Simplify right side
   30,949.34x = 891,682,158.20
5. Step 5: Solve for x
   x = 891,682,158.20/30,949.34
6. Step 6: Final answer
   x = 28,811.02