Finding the Fourth Proportional to 2,155.60, 3,231.58 and 1,180.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.60 : 3,231.58 = 1,180.77 : x
2. Step 2: Convert to fraction form
   2,155.60/3,231.58 = 1,180.77/x
3. Step 3: Cross multiply
   2,155.60x = 3,231.58 × 1,180.77
4. Step 4: Simplify right side
   2,155.60x = 3,815,752.72
5. Step 5: Solve for x
   x = 3,815,752.72/2,155.60
6. Step 6: Final answer
   x = 1,770.16