Finding the Fourth Proportional to 2,189.16, 3,280.86 and 889.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.16 : 3,280.86 = 889.92 : x
2. Step 2: Convert to fraction form
   2,189.16/3,280.86 = 889.92/x
3. Step 3: Cross multiply
   2,189.16x = 3,280.86 × 889.92
4. Step 4: Simplify right side
   2,189.16x = 2,919,702.93
5. Step 5: Solve for x
   x = 2,919,702.93/2,189.16
6. Step 6: Final answer
   x = 1,333.71