Finding the Fourth Proportional to 30,963.92, 42,747.91 and 20,384.30

Step by Step Solution

1. Step 1: Write the proportion equation
   30,963.92 : 42,747.91 = 20,384.30 : x
2. Step 2: Convert to fraction form
   30,963.92/42,747.91 = 20,384.30/x
3. Step 3: Cross multiply
   30,963.92x = 42,747.91 × 20,384.30
4. Step 4: Simplify right side
   30,963.92x = 871,386,277.72
5. Step 5: Solve for x
   x = 871,386,277.72/30,963.92
6. Step 6: Final answer
   x = 28,141.99