Finding the Fourth Proportional to 1,456.12, 2,180.64 and 724.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.12 : 2,180.64 = 724.72 : x
2. Step 2: Convert to fraction form
   1,456.12/2,180.64 = 724.72/x
3. Step 3: Cross multiply
   1,456.12x = 2,180.64 × 724.72
4. Step 4: Simplify right side
   1,456.12x = 1,580,353.42
5. Step 5: Solve for x
   x = 1,580,353.42/1,456.12
6. Step 6: Final answer
   x = 1,085.32