Finding the Fourth Proportional to 2,815.09, 4,221.42 and 1,082.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.09 : 4,221.42 = 1,082.50 : x
2. Step 2: Convert to fraction form
   2,815.09/4,221.42 = 1,082.50/x
3. Step 3: Cross multiply
   2,815.09x = 4,221.42 × 1,082.50
4. Step 4: Simplify right side
   2,815.09x = 4,569,687.15
5. Step 5: Solve for x
   x = 4,569,687.15/2,815.09
6. Step 6: Final answer
   x = 1,623.28