Finding the Fourth Proportional to 2,112.81, 2,916.03 and 1,229.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.81 : 2,916.03 = 1,229.12 : x
2. Step 2: Convert to fraction form
   2,112.81/2,916.03 = 1,229.12/x
3. Step 3: Cross multiply
   2,112.81x = 2,916.03 × 1,229.12
4. Step 4: Simplify right side
   2,112.81x = 3,584,150.79
5. Step 5: Solve for x
   x = 3,584,150.79/2,112.81
6. Step 6: Final answer
   x = 1,696.39