Finding the Fourth Proportional to 2,500.39, 3,749.23 and 768.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.39 : 3,749.23 = 768.79 : x
2. Step 2: Convert to fraction form
   2,500.39/3,749.23 = 768.79/x
3. Step 3: Cross multiply
   2,500.39x = 3,749.23 × 768.79
4. Step 4: Simplify right side
   2,500.39x = 2,882,370.53
5. Step 5: Solve for x
   x = 2,882,370.53/2,500.39
6. Step 6: Final answer
   x = 1,152.77