Finding the Fourth Proportional to 2,328.90, 3,493.89 and 768.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.90 : 3,493.89 = 768.81 : x
2. Step 2: Convert to fraction form
   2,328.90/3,493.89 = 768.81/x
3. Step 3: Cross multiply
   2,328.90x = 3,493.89 × 768.81
4. Step 4: Simplify right side
   2,328.90x = 2,686,137.57
5. Step 5: Solve for x
   x = 2,686,137.57/2,328.90
6. Step 6: Final answer
   x = 1,153.39