Finding the Fourth Proportional to 2,231.57, 3,079.31 and 1,236.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.57 : 3,079.31 = 1,236.60 : x
2. Step 2: Convert to fraction form
   2,231.57/3,079.31 = 1,236.60/x
3. Step 3: Cross multiply
   2,231.57x = 3,079.31 × 1,236.60
4. Step 4: Simplify right side
   2,231.57x = 3,807,874.75
5. Step 5: Solve for x
   x = 3,807,874.75/2,231.57
6. Step 6: Final answer
   x = 1,706.37