Finding the Fourth Proportional to 2,085.36, 3,128.88 and 786.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.36 : 3,128.88 = 786.93 : x
2. Step 2: Convert to fraction form
   2,085.36/3,128.88 = 786.93/x
3. Step 3: Cross multiply
   2,085.36x = 3,128.88 × 786.93
4. Step 4: Simplify right side
   2,085.36x = 2,462,209.54
5. Step 5: Solve for x
   x = 2,462,209.54/2,085.36
6. Step 6: Final answer
   x = 1,180.71