Finding the Fourth Proportional to 2,085.09, 3,128.10 and 786.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.09 : 3,128.10 = 786.57 : x
2. Step 2: Convert to fraction form
   2,085.09/3,128.10 = 786.57/x
3. Step 3: Cross multiply
   2,085.09x = 3,128.10 × 786.57
4. Step 4: Simplify right side
   2,085.09x = 2,460,469.62
5. Step 5: Solve for x
   x = 2,460,469.62/2,085.09
6. Step 6: Final answer
   x = 1,180.03