Finding the Fourth Proportional to 2,512.39, 3,768.89 and 869.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,512.39 : 3,768.89 = 869.31 : x
2. Step 2: Convert to fraction form
   2,512.39/3,768.89 = 869.31/x
3. Step 3: Cross multiply
   2,512.39x = 3,768.89 × 869.31
4. Step 4: Simplify right side
   2,512.39x = 3,276,333.77
5. Step 5: Solve for x
   x = 3,276,333.77/2,512.39
6. Step 6: Final answer
   x = 1,304.07