Finding the Fourth Proportional to 2,231.89, 3,080.44 and 1,288.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.89 : 3,080.44 = 1,288.29 : x
2. Step 2: Convert to fraction form
   2,231.89/3,080.44 = 1,288.29/x
3. Step 3: Cross multiply
   2,231.89x = 3,080.44 × 1,288.29
4. Step 4: Simplify right side
   2,231.89x = 3,968,500.05
5. Step 5: Solve for x
   x = 3,968,500.05/2,231.89
6. Step 6: Final answer
   x = 1,778.09