Finding the Fourth Proportional to 2,155.73, 3,233.31 and 838.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.73 : 3,233.31 = 838.91 : x
2. Step 2: Convert to fraction form
   2,155.73/3,233.31 = 838.91/x
3. Step 3: Cross multiply
   2,155.73x = 3,233.31 × 838.91
4. Step 4: Simplify right side
   2,155.73x = 2,712,439.93
5. Step 5: Solve for x
   x = 2,712,439.93/2,155.73
6. Step 6: Final answer
   x = 1,258.25