Finding the Fourth Proportional to 2,186.72, 3,280.02 and 889.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.72 : 3,280.02 = 889.10 : x
2. Step 2: Convert to fraction form
   2,186.72/3,280.02 = 889.10/x
3. Step 3: Cross multiply
   2,186.72x = 3,280.02 × 889.10
4. Step 4: Simplify right side
   2,186.72x = 2,916,265.78
5. Step 5: Solve for x
   x = 2,916,265.78/2,186.72
6. Step 6: Final answer
   x = 1,333.63