Finding the Fourth Proportional to 2,181.35, 3,272.72 and 721.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.35 : 3,272.72 = 721.53 : x
2. Step 2: Convert to fraction form
   2,181.35/3,272.72 = 721.53/x
3. Step 3: Cross multiply
   2,181.35x = 3,272.72 × 721.53
4. Step 4: Simplify right side
   2,181.35x = 2,361,362.05
5. Step 5: Solve for x
   x = 2,361,362.05/2,181.35
6. Step 6: Final answer
   x = 1,082.52