Finding the Fourth Proportional to 1,377.98, 2,067.28 and 728.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.98 : 2,067.28 = 728.58 : x
2. Step 2: Convert to fraction form
   1,377.98/2,067.28 = 728.58/x
3. Step 3: Cross multiply
   1,377.98x = 2,067.28 × 728.58
4. Step 4: Simplify right side
   1,377.98x = 1,506,178.86
5. Step 5: Solve for x
   x = 1,506,178.86/1,377.98
6. Step 6: Final answer
   x = 1,093.03