Finding the Fourth Proportional to 2,113.29, 2,916.45 and 1,229.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.29 : 2,916.45 = 1,229.31 : x
2. Step 2: Convert to fraction form
   2,113.29/2,916.45 = 1,229.31/x
3. Step 3: Cross multiply
   2,113.29x = 2,916.45 × 1,229.31
4. Step 4: Simplify right side
   2,113.29x = 3,585,221.15
5. Step 5: Solve for x
   x = 3,585,221.15/2,113.29
6. Step 6: Final answer
   x = 1,696.51