Finding the Fourth Proportional to 3,940.54, 5,437.72 and 2,171.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.54 : 5,437.72 = 2,171.76 : x
2. Step 2: Convert to fraction form
   3,940.54/5,437.72 = 2,171.76/x
3. Step 3: Cross multiply
   3,940.54x = 5,437.72 × 2,171.76
4. Step 4: Simplify right side
   3,940.54x = 11,809,422.79
5. Step 5: Solve for x
   x = 11,809,422.79/3,940.54
6. Step 6: Final answer
   x = 2,996.90