Finding the Fourth Proportional to 30,659.15, 42,270.59 and 20,571.62

Step by Step Solution

1. Step 1: Write the proportion equation
   30,659.15 : 42,270.59 = 20,571.62 : x
2. Step 2: Convert to fraction form
   30,659.15/42,270.59 = 20,571.62/x
3. Step 3: Cross multiply
   30,659.15x = 42,270.59 × 20,571.62
4. Step 4: Simplify right side
   30,659.15x = 869,574,354.73
5. Step 5: Solve for x
   x = 869,574,354.73/30,659.15
6. Step 6: Final answer
   x = 28,362.64