Finding the Fourth Proportional to 1,297.89, 1,791.05 and 773.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.89 : 1,791.05 = 773.55 : x
2. Step 2: Convert to fraction form
   1,297.89/1,791.05 = 773.55/x
3. Step 3: Cross multiply
   1,297.89x = 1,791.05 × 773.55
4. Step 4: Simplify right side
   1,297.89x = 1,385,462.86
5. Step 5: Solve for x
   x = 1,385,462.86/1,297.89
6. Step 6: Final answer
   x = 1,067.47