Finding the Fourth Proportional to 2,187.34, 3,282.32 and 870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.34 : 3,282.32 = 870.86 : x
2. Step 2: Convert to fraction form
   2,187.34/3,282.32 = 870.86/x
3. Step 3: Cross multiply
   2,187.34x = 3,282.32 × 870.86
4. Step 4: Simplify right side
   2,187.34x = 2,858,451.58
5. Step 5: Solve for x
   x = 2,858,451.58/2,187.34
6. Step 6: Final answer
   x = 1,306.82