Finding the Fourth Proportional to 2,155.98, 3,233.61 and 769.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.98 : 3,233.61 = 769.11 : x
2. Step 2: Convert to fraction form
   2,155.98/3,233.61 = 769.11/x
3. Step 3: Cross multiply
   2,155.98x = 3,233.61 × 769.11
4. Step 4: Simplify right side
   2,155.98x = 2,487,001.79
5. Step 5: Solve for x
   x = 2,487,001.79/2,155.98
6. Step 6: Final answer
   x = 1,153.54