Finding the Fourth Proportional to 39,865.46, 55,016.86 and 21,960.48

Step by Step Solution

1. Step 1: Write the proportion equation
   39,865.46 : 55,016.86 = 21,960.48 : x
2. Step 2: Convert to fraction form
   39,865.46/55,016.86 = 21,960.48/x
3. Step 3: Cross multiply
   39,865.46x = 55,016.86 × 21,960.48
4. Step 4: Simplify right side
   39,865.46x = 1,208,196,653.69
5. Step 5: Solve for x
   x = 1,208,196,653.69/39,865.46
6. Step 6: Final answer
   x = 30,306.85