Finding the Fourth Proportional to 2,124.89, 3,189.30 and 1,085.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.89 : 3,189.30 = 1,085.64 : x
2. Step 2: Convert to fraction form
   2,124.89/3,189.30 = 1,085.64/x
3. Step 3: Cross multiply
   2,124.89x = 3,189.30 × 1,085.64
4. Step 4: Simplify right side
   2,124.89x = 3,462,431.65
5. Step 5: Solve for x
   x = 3,462,431.65/2,124.89
6. Step 6: Final answer
   x = 1,629.46