Finding the Fourth Proportional to 2,057.15, 3,085.17 and 1,191.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.15 : 3,085.17 = 1,191.47 : x
2. Step 2: Convert to fraction form
   2,057.15/3,085.17 = 1,191.47/x
3. Step 3: Cross multiply
   2,057.15x = 3,085.17 × 1,191.47
4. Step 4: Simplify right side
   2,057.15x = 3,675,872.07
5. Step 5: Solve for x
   x = 3,675,872.07/2,057.15
6. Step 6: Final answer
   x = 1,786.88