Finding the Fourth Proportional to 2,181.96, 3,273.12 and 720.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.96 : 3,273.12 = 720.72 : x
2. Step 2: Convert to fraction form
   2,181.96/3,273.12 = 720.72/x
3. Step 3: Cross multiply
   2,181.96x = 3,273.12 × 720.72
4. Step 4: Simplify right side
   2,181.96x = 2,359,003.05
5. Step 5: Solve for x
   x = 2,359,003.05/2,181.96
6. Step 6: Final answer
   x = 1,081.14