Finding the Fourth Proportional to 2,155.58, 3,231.60 and 768.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.58 : 3,231.60 = 768.14 : x
2. Step 2: Convert to fraction form
   2,155.58/3,231.60 = 768.14/x
3. Step 3: Cross multiply
   2,155.58x = 3,231.60 × 768.14
4. Step 4: Simplify right side
   2,155.58x = 2,482,321.22
5. Step 5: Solve for x
   x = 2,482,321.22/2,155.58
6. Step 6: Final answer
   x = 1,151.58