Finding the Fourth Proportional to 2,145.72, 3,211.28 and 1,660.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.72 : 3,211.28 = 1,660.94 : x
2. Step 2: Convert to fraction form
   2,145.72/3,211.28 = 1,660.94/x
3. Step 3: Cross multiply
   2,145.72x = 3,211.28 × 1,660.94
4. Step 4: Simplify right side
   2,145.72x = 5,333,743.40
5. Step 5: Solve for x
   x = 5,333,743.40/2,145.72
6. Step 6: Final answer
   x = 2,485.76