Finding the Fourth Proportional to 2,185.79, 3,279.67 and 1,145.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.79 : 3,279.67 = 1,145.55 : x
2. Step 2: Convert to fraction form
   2,185.79/3,279.67 = 1,145.55/x
3. Step 3: Cross multiply
   2,185.79x = 3,279.67 × 1,145.55
4. Step 4: Simplify right side
   2,185.79x = 3,757,020.24
5. Step 5: Solve for x
   x = 3,757,020.24/2,185.79
6. Step 6: Final answer
   x = 1,718.84