Finding the Fourth Proportional to 2,113.23, 2,916.72 and 1,229.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.23 : 2,916.72 = 1,229.55 : x
2. Step 2: Convert to fraction form
   2,113.23/2,916.72 = 1,229.55/x
3. Step 3: Cross multiply
   2,113.23x = 2,916.72 × 1,229.55
4. Step 4: Simplify right side
   2,113.23x = 3,586,253.08
5. Step 5: Solve for x
   x = 3,586,253.08/2,113.23
6. Step 6: Final answer
   x = 1,697.05