Finding the Fourth Proportional to 2,124.81, 3,185.82 and 1,085.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.81 : 3,185.82 = 1,085.31 : x
2. Step 2: Convert to fraction form
   2,124.81/3,185.82 = 1,085.31/x
3. Step 3: Cross multiply
   2,124.81x = 3,185.82 × 1,085.31
4. Step 4: Simplify right side
   2,124.81x = 3,457,602.30
5. Step 5: Solve for x
   x = 3,457,602.30/2,124.81
6. Step 6: Final answer
   x = 1,627.25