Finding the Fourth Proportional to 2,171.33, 3,257.91 and 1,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.33 : 3,257.91 = 1,131.60 : x
2. Step 2: Convert to fraction form
   2,171.33/3,257.91 = 1,131.60/x
3. Step 3: Cross multiply
   2,171.33x = 3,257.91 × 1,131.60
4. Step 4: Simplify right side
   2,171.33x = 3,686,650.96
5. Step 5: Solve for x
   x = 3,686,650.96/2,171.33
6. Step 6: Final answer
   x = 1,697.88