Finding the Fourth Proportional to 2,747.89, 4,121.38 and 992.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,747.89 : 4,121.38 = 992.55 : x
2. Step 2: Convert to fraction form
   2,747.89/4,121.38 = 992.55/x
3. Step 3: Cross multiply
   2,747.89x = 4,121.38 × 992.55
4. Step 4: Simplify right side
   2,747.89x = 4,090,683.54
5. Step 5: Solve for x
   x = 4,090,683.54/2,747.89
6. Step 6: Final answer
   x = 1,488.66