Finding the Fourth Proportional to 30,478.37, 42,059.20 and 16,865.59

Step by Step Solution

1. Step 1: Write the proportion equation
   30,478.37 : 42,059.20 = 16,865.59 : x
2. Step 2: Convert to fraction form
   30,478.37/42,059.20 = 16,865.59/x
3. Step 3: Cross multiply
   30,478.37x = 42,059.20 × 16,865.59
4. Step 4: Simplify right side
   30,478.37x = 709,353,233.34
5. Step 5: Solve for x
   x = 709,353,233.34/30,478.37
6. Step 6: Final answer
   x = 23,273.99