Finding the Fourth Proportional to 2,187.40, 3,282.78 and 889.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.40 : 3,282.78 = 889.96 : x
2. Step 2: Convert to fraction form
   2,187.40/3,282.78 = 889.96/x
3. Step 3: Cross multiply
   2,187.40x = 3,282.78 × 889.96
4. Step 4: Simplify right side
   2,187.40x = 2,921,542.89
5. Step 5: Solve for x
   x = 2,921,542.89/2,187.40
6. Step 6: Final answer
   x = 1,335.62