Finding the Fourth Proportional to 39,731.72, 54,830.12 and 21,827.12

Step by Step Solution

1. Step 1: Write the proportion equation
   39,731.72 : 54,830.12 = 21,827.12 : x
2. Step 2: Convert to fraction form
   39,731.72/54,830.12 = 21,827.12/x
3. Step 3: Cross multiply
   39,731.72x = 54,830.12 × 21,827.12
4. Step 4: Simplify right side
   39,731.72x = 1,196,783,608.85
5. Step 5: Solve for x
   x = 1,196,783,608.85/39,731.72
6. Step 6: Final answer
   x = 30,121.62