Finding the Fourth Proportional to 2,112.85, 3,165.20 and 1,185.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.85 : 3,165.20 = 1,185.58 : x
2. Step 2: Convert to fraction form
   2,112.85/3,165.20 = 1,185.58/x
3. Step 3: Cross multiply
   2,112.85x = 3,165.20 × 1,185.58
4. Step 4: Simplify right side
   2,112.85x = 3,752,576.06
5. Step 5: Solve for x
   x = 3,752,576.06/2,112.85
6. Step 6: Final answer
   x = 1,776.08