Finding the Fourth Proportional to 2,817.75, 4,228.17 and 1,152.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.75 : 4,228.17 = 1,152.78 : x
2. Step 2: Convert to fraction form
   2,817.75/4,228.17 = 1,152.78/x
3. Step 3: Cross multiply
   2,817.75x = 4,228.17 × 1,152.78
4. Step 4: Simplify right side
   2,817.75x = 4,874,149.81
5. Step 5: Solve for x
   x = 4,874,149.81/2,817.75
6. Step 6: Final answer
   x = 1,729.80