Finding the Fourth Proportional to 2,085.36, 3,131.61 and 1,851.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.36 : 3,131.61 = 1,851.62 : x
2. Step 2: Convert to fraction form
   2,085.36/3,131.61 = 1,851.62/x
3. Step 3: Cross multiply
   2,085.36x = 3,131.61 × 1,851.62
4. Step 4: Simplify right side
   2,085.36x = 5,798,568.22
5. Step 5: Solve for x
   x = 5,798,568.22/2,085.36
6. Step 6: Final answer
   x = 2,780.61