Finding the Fourth Proportional to 1,452.78, 2,177.35 and 721.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,452.78 : 2,177.35 = 721.05 : x
2. Step 2: Convert to fraction form
   1,452.78/2,177.35 = 721.05/x
3. Step 3: Cross multiply
   1,452.78x = 2,177.35 × 721.05
4. Step 4: Simplify right side
   1,452.78x = 1,569,978.22
5. Step 5: Solve for x
   x = 1,569,978.22/1,452.78
6. Step 6: Final answer
   x = 1,080.67