Finding the Fourth Proportional to 2,085.07, 3,128.33 and 786.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.07 : 3,128.33 = 786.91 : x
2. Step 2: Convert to fraction form
   2,085.07/3,128.33 = 786.91/x
3. Step 3: Cross multiply
   2,085.07x = 3,128.33 × 786.91
4. Step 4: Simplify right side
   2,085.07x = 2,461,710.23
5. Step 5: Solve for x
   x = 2,461,710.23/2,085.07
6. Step 6: Final answer
   x = 1,180.64