Finding the Fourth Proportional to 1,147.74, 1,719.12 and 855.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.74 : 1,719.12 = 855.72 : x
2. Step 2: Convert to fraction form
   1,147.74/1,719.12 = 855.72/x
3. Step 3: Cross multiply
   1,147.74x = 1,719.12 × 855.72
4. Step 4: Simplify right side
   1,147.74x = 1,471,085.37
5. Step 5: Solve for x
   x = 1,471,085.37/1,147.74
6. Step 6: Final answer
   x = 1,281.72