Finding the Fourth Proportional to 2,815.36, 4,220.56 and 1,082.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.36 : 4,220.56 = 1,082.72 : x
2. Step 2: Convert to fraction form
   2,815.36/4,220.56 = 1,082.72/x
3. Step 3: Cross multiply
   2,815.36x = 4,220.56 × 1,082.72
4. Step 4: Simplify right side
   2,815.36x = 4,569,684.72
5. Step 5: Solve for x
   x = 4,569,684.72/2,815.36
6. Step 6: Final answer
   x = 1,623.13