Finding the Fourth Proportional to 2,187.39, 3,280.82 and 887.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.39 : 3,280.82 = 887.61 : x
2. Step 2: Convert to fraction form
   2,187.39/3,280.82 = 887.61/x
3. Step 3: Cross multiply
   2,187.39x = 3,280.82 × 887.61
4. Step 4: Simplify right side
   2,187.39x = 2,912,084.20
5. Step 5: Solve for x
   x = 2,912,084.20/2,187.39
6. Step 6: Final answer
   x = 1,331.31