Finding the Fourth Proportional to 3,047.10, 4,569.72 and 855.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,047.10 : 4,569.72 = 855.30 : x
2. Step 2: Convert to fraction form
   3,047.10/4,569.72 = 855.30/x
3. Step 3: Cross multiply
   3,047.10x = 4,569.72 × 855.30
4. Step 4: Simplify right side
   3,047.10x = 3,908,481.52
5. Step 5: Solve for x
   x = 3,908,481.52/3,047.10
6. Step 6: Final answer
   x = 1,282.69