Finding the Fourth Proportional to 2,113.56, 2,916.72 and 1,229.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.56 : 2,916.72 = 1,229.13 : x
2. Step 2: Convert to fraction form
   2,113.56/2,916.72 = 1,229.13/x
3. Step 3: Cross multiply
   2,113.56x = 2,916.72 × 1,229.13
4. Step 4: Simplify right side
   2,113.56x = 3,585,028.05
5. Step 5: Solve for x
   x = 3,585,028.05/2,113.56
6. Step 6: Final answer
   x = 1,696.20