Finding the Fourth Proportional to 30,533.20, 42,139.72 and 17,959.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,533.20 : 42,139.72 = 17,959.12 : x
2. Step 2: Convert to fraction form
   30,533.20/42,139.72 = 17,959.12/x
3. Step 3: Cross multiply
   30,533.20x = 42,139.72 × 17,959.12
4. Step 4: Simplify right side
   30,533.20x = 756,792,288.25
5. Step 5: Solve for x
   x = 756,792,288.25/30,533.20
6. Step 6: Final answer
   x = 24,785.88