Finding the Fourth Proportional to 3,940.12, 5,436.78 and 2,261.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.12 : 5,436.78 = 2,261.59 : x
2. Step 2: Convert to fraction form
   3,940.12/5,436.78 = 2,261.59/x
3. Step 3: Cross multiply
   3,940.12x = 5,436.78 × 2,261.59
4. Step 4: Simplify right side
   3,940.12x = 12,295,767.28
5. Step 5: Solve for x
   x = 12,295,767.28/3,940.12
6. Step 6: Final answer
   x = 3,120.66