Finding the Fourth Proportional to 2,790.89, 4,186.97 and 1,231.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.89 : 4,186.97 = 1,231.33 : x
2. Step 2: Convert to fraction form
   2,790.89/4,186.97 = 1,231.33/x
3. Step 3: Cross multiply
   2,790.89x = 4,186.97 × 1,231.33
4. Step 4: Simplify right side
   2,790.89x = 5,155,525.15
5. Step 5: Solve for x
   x = 5,155,525.15/2,790.89
6. Step 6: Final answer
   x = 1,847.27