Finding the Fourth Proportional to 2,105.52, 3,159.10 and 1,131.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.52 : 3,159.10 = 1,131.12 : x
2. Step 2: Convert to fraction form
   2,105.52/3,159.10 = 1,131.12/x
3. Step 3: Cross multiply
   2,105.52x = 3,159.10 × 1,131.12
4. Step 4: Simplify right side
   2,105.52x = 3,573,321.19
5. Step 5: Solve for x
   x = 3,573,321.19/2,105.52
6. Step 6: Final answer
   x = 1,697.12