Finding the Fourth Proportional to 2,185.09, 3,275.65 and 1,089.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.09 : 3,275.65 = 1,089.79 : x
2. Step 2: Convert to fraction form
   2,185.09/3,275.65 = 1,089.79/x
3. Step 3: Cross multiply
   2,185.09x = 3,275.65 × 1,089.79
4. Step 4: Simplify right side
   2,185.09x = 3,569,748.79
5. Step 5: Solve for x
   x = 3,569,748.79/2,185.09
6. Step 6: Final answer
   x = 1,633.69