Finding the Fourth Proportional to 2,089.17, 3,131.89 and 791.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.17 : 3,131.89 = 791.55 : x
2. Step 2: Convert to fraction form
   2,089.17/3,131.89 = 791.55/x
3. Step 3: Cross multiply
   2,089.17x = 3,131.89 × 791.55
4. Step 4: Simplify right side
   2,089.17x = 2,479,047.53
5. Step 5: Solve for x
   x = 2,479,047.53/2,089.17
6. Step 6: Final answer
   x = 1,186.62