Finding the Fourth Proportional to 1,348.08, 2,018.53 and 728.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.08 : 2,018.53 = 728.89 : x
2. Step 2: Convert to fraction form
   1,348.08/2,018.53 = 728.89/x
3. Step 3: Cross multiply
   1,348.08x = 2,018.53 × 728.89
4. Step 4: Simplify right side
   1,348.08x = 1,471,280.38
5. Step 5: Solve for x
   x = 1,471,280.38/1,348.08
6. Step 6: Final answer
   x = 1,091.39