Finding the Fourth Proportional to 30,591.05, 42,234.56 and 20,396.43

Step by Step Solution

1. Step 1: Write the proportion equation
   30,591.05 : 42,234.56 = 20,396.43 : x
2. Step 2: Convert to fraction form
   30,591.05/42,234.56 = 20,396.43/x
3. Step 3: Cross multiply
   30,591.05x = 42,234.56 × 20,396.43
4. Step 4: Simplify right side
   30,591.05x = 861,434,062.75
5. Step 5: Solve for x
   x = 861,434,062.75/30,591.05
6. Step 6: Final answer
   x = 28,159.67