Finding the Fourth Proportional to 31,019.56, 42,806.48 and 17,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.56 : 42,806.48 = 17,221.42 : x
2. Step 2: Convert to fraction form
   31,019.56/42,806.48 = 17,221.42/x
3. Step 3: Cross multiply
   31,019.56x = 42,806.48 × 17,221.42
4. Step 4: Simplify right side
   31,019.56x = 737,188,370.80
5. Step 5: Solve for x
   x = 737,188,370.80/31,019.56
6. Step 6: Final answer
   x = 23,765.27