Finding the Fourth Proportional to 2,081.70, 2,872.47 and 1,185.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.70 : 2,872.47 = 1,185.42 : x
2. Step 2: Convert to fraction form
   2,081.70/2,872.47 = 1,185.42/x
3. Step 3: Cross multiply
   2,081.70x = 2,872.47 × 1,185.42
4. Step 4: Simplify right side
   2,081.70x = 3,405,083.39
5. Step 5: Solve for x
   x = 3,405,083.39/2,081.70
6. Step 6: Final answer
   x = 1,635.72