Finding the Fourth Proportional to 1,317.52, 1,974.54 and 855.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.52 : 1,974.54 = 855.10 : x
2. Step 2: Convert to fraction form
   1,317.52/1,974.54 = 855.10/x
3. Step 3: Cross multiply
   1,317.52x = 1,974.54 × 855.10
4. Step 4: Simplify right side
   1,317.52x = 1,688,429.15
5. Step 5: Solve for x
   x = 1,688,429.15/1,317.52
6. Step 6: Final answer
   x = 1,281.52