Finding the Fourth Proportional to 2,661.81, 3,987.27 and 1,270.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.81 : 3,987.27 = 1,270.91 : x
2. Step 2: Convert to fraction form
   2,661.81/3,987.27 = 1,270.91/x
3. Step 3: Cross multiply
   2,661.81x = 3,987.27 × 1,270.91
4. Step 4: Simplify right side
   2,661.81x = 5,067,441.38
5. Step 5: Solve for x
   x = 5,067,441.38/2,661.81
6. Step 6: Final answer
   x = 1,903.76