Finding the Fourth Proportional to 2,112.69, 2,916.06 and 1,228.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.69 : 2,916.06 = 1,228.38 : x
2. Step 2: Convert to fraction form
   2,112.69/2,916.06 = 1,228.38/x
3. Step 3: Cross multiply
   2,112.69x = 2,916.06 × 1,228.38
4. Step 4: Simplify right side
   2,112.69x = 3,582,029.78
5. Step 5: Solve for x
   x = 3,582,029.78/2,112.69
6. Step 6: Final answer
   x = 1,695.48