Finding the Fourth Proportional to 820.94, 1,128.72 and 731.58

Step by Step Solution

1. Step 1: Write the proportion equation
   820.94 : 1,128.72 = 731.58 : x
2. Step 2: Convert to fraction form
   820.94/1,128.72 = 731.58/x
3. Step 3: Cross multiply
   820.94x = 1,128.72 × 731.58
4. Step 4: Simplify right side
   820.94x = 825,749.72
5. Step 5: Solve for x
   x = 825,749.72/820.94
6. Step 6: Final answer
   x = 1,005.86