Finding the Fourth Proportional to 41,399.91, 57,005.35 and 31,205.76

Step by Step Solution

1. Step 1: Write the proportion equation
   41,399.91 : 57,005.35 = 31,205.76 : x
2. Step 2: Convert to fraction form
   41,399.91/57,005.35 = 31,205.76/x
3. Step 3: Cross multiply
   41,399.91x = 57,005.35 × 31,205.76
4. Step 4: Simplify right side
   41,399.91x = 1,778,895,270.82
5. Step 5: Solve for x
   x = 1,778,895,270.82/41,399.91
6. Step 6: Final answer
   x = 42,968.58