Finding the Fourth Proportional to 2,131.36, 3,197.33 and 1,091.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.36 : 3,197.33 = 1,091.91 : x
2. Step 2: Convert to fraction form
   2,131.36/3,197.33 = 1,091.91/x
3. Step 3: Cross multiply
   2,131.36x = 3,197.33 × 1,091.91
4. Step 4: Simplify right side
   2,131.36x = 3,491,196.60
5. Step 5: Solve for x
   x = 3,491,196.60/2,131.36
6. Step 6: Final answer
   x = 1,638.01