Finding the Fourth Proportional to 2,155.50, 3,233.55 and 1,115.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.50 : 3,233.55 = 1,115.61 : x
2. Step 2: Convert to fraction form
   2,155.50/3,233.55 = 1,115.61/x
3. Step 3: Cross multiply
   2,155.50x = 3,233.55 × 1,115.61
4. Step 4: Simplify right side
   2,155.50x = 3,607,380.72
5. Step 5: Solve for x
   x = 3,607,380.72/2,155.50
6. Step 6: Final answer
   x = 1,673.57