Finding the Fourth Proportional to 30,600.96, 42,231.48 and 16,989.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,600.96 : 42,231.48 = 16,989.72 : x
2. Step 2: Convert to fraction form
   30,600.96/42,231.48 = 16,989.72/x
3. Step 3: Cross multiply
   30,600.96x = 42,231.48 × 16,989.72
4. Step 4: Simplify right side
   30,600.96x = 717,501,020.39
5. Step 5: Solve for x
   x = 717,501,020.39/30,600.96
6. Step 6: Final answer
   x = 23,447.01