Finding the Fourth Proportional to 3,940.26, 5,437.34 and 2,261.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.26 : 5,437.34 = 2,261.31 : x
2. Step 2: Convert to fraction form
   3,940.26/5,437.34 = 2,261.31/x
3. Step 3: Cross multiply
   3,940.26x = 5,437.34 × 2,261.31
4. Step 4: Simplify right side
   3,940.26x = 12,295,500.01
5. Step 5: Solve for x
   x = 12,295,500.01/3,940.26
6. Step 6: Final answer
   x = 3,120.48