Finding the Fourth Proportional to 2,185.16, 3,279.62 and 1,145.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.16 : 3,279.62 = 1,145.89 : x
2. Step 2: Convert to fraction form
   2,185.16/3,279.62 = 1,145.89/x
3. Step 3: Cross multiply
   2,185.16x = 3,279.62 × 1,145.89
4. Step 4: Simplify right side
   2,185.16x = 3,758,067.36
5. Step 5: Solve for x
   x = 3,758,067.36/2,185.16
6. Step 6: Final answer
   x = 1,719.81