Finding the Fourth Proportional to 2,187.38, 3,281.57 and 871.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.38 : 3,281.57 = 871.21 : x
2. Step 2: Convert to fraction form
   2,187.38/3,281.57 = 871.21/x
3. Step 3: Cross multiply
   2,187.38x = 3,281.57 × 871.21
4. Step 4: Simplify right side
   2,187.38x = 2,858,930.57
5. Step 5: Solve for x
   x = 2,858,930.57/2,187.38
6. Step 6: Final answer
   x = 1,307.01