Finding the Fourth Proportional to 1,093.02, 1,640.56 and 728.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.02 : 1,640.56 = 728.07 : x
2. Step 2: Convert to fraction form
   1,093.02/1,640.56 = 728.07/x
3. Step 3: Cross multiply
   1,093.02x = 1,640.56 × 728.07
4. Step 4: Simplify right side
   1,093.02x = 1,194,442.52
5. Step 5: Solve for x
   x = 1,194,442.52/1,093.02
6. Step 6: Final answer
   x = 1,092.79