Finding the Fourth Proportional to 2,181.76, 3,274.50 and 1,085.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.76 : 3,274.50 = 1,085.80 : x
2. Step 2: Convert to fraction form
   2,181.76/3,274.50 = 1,085.80/x
3. Step 3: Cross multiply
   2,181.76x = 3,274.50 × 1,085.80
4. Step 4: Simplify right side
   2,181.76x = 3,555,452.10
5. Step 5: Solve for x
   x = 3,555,452.10/2,181.76
6. Step 6: Final answer
   x = 1,629.63