Finding the Fourth Proportional to 2,181.51, 3,272.13 and 1,085.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.51 : 3,272.13 = 1,085.58 : x
2. Step 2: Convert to fraction form
   2,181.51/3,272.13 = 1,085.58/x
3. Step 3: Cross multiply
   2,181.51x = 3,272.13 × 1,085.58
4. Step 4: Simplify right side
   2,181.51x = 3,552,158.89
5. Step 5: Solve for x
   x = 3,552,158.89/2,181.51
6. Step 6: Final answer
   x = 1,628.30