Finding the Fourth Proportional to 2,155.02, 3,231.89 and 768.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.02 : 3,231.89 = 768.18 : x
2. Step 2: Convert to fraction form
   2,155.02/3,231.89 = 768.18/x
3. Step 3: Cross multiply
   2,155.02x = 3,231.89 × 768.18
4. Step 4: Simplify right side
   2,155.02x = 2,482,669.42
5. Step 5: Solve for x
   x = 2,482,669.42/2,155.02
6. Step 6: Final answer
   x = 1,152.04