Finding the Fourth Proportional to 2,112.66, 2,915.37 and 1,228.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.66 : 2,915.37 = 1,228.41 : x
2. Step 2: Convert to fraction form
   2,112.66/2,915.37 = 1,228.41/x
3. Step 3: Cross multiply
   2,112.66x = 2,915.37 × 1,228.41
4. Step 4: Simplify right side
   2,112.66x = 3,581,269.66
5. Step 5: Solve for x
   x = 3,581,269.66/2,112.66
6. Step 6: Final answer
   x = 1,695.15