Finding the Fourth Proportional to 2,411.90, 3,618.35 and 768.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.90 : 3,618.35 = 768.57 : x
2. Step 2: Convert to fraction form
   2,411.90/3,618.35 = 768.57/x
3. Step 3: Cross multiply
   2,411.90x = 3,618.35 × 768.57
4. Step 4: Simplify right side
   2,411.90x = 2,780,955.26
5. Step 5: Solve for x
   x = 2,780,955.26/2,411.90
6. Step 6: Final answer
   x = 1,153.01