Finding the Fourth Proportional to 2,181.57, 3,272.76 and 720.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.57 : 3,272.76 = 720.84 : x
2. Step 2: Convert to fraction form
   2,181.57/3,272.76 = 720.84/x
3. Step 3: Cross multiply
   2,181.57x = 3,272.76 × 720.84
4. Step 4: Simplify right side
   2,181.57x = 2,359,136.32
5. Step 5: Solve for x
   x = 2,359,136.32/2,181.57
6. Step 6: Final answer
   x = 1,081.39