Finding the Fourth Proportional to 2,391.76, 3,587.68 and 852.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.76 : 3,587.68 = 852.72 : x
2. Step 2: Convert to fraction form
   2,391.76/3,587.68 = 852.72/x
3. Step 3: Cross multiply
   2,391.76x = 3,587.68 × 852.72
4. Step 4: Simplify right side
   2,391.76x = 3,059,286.49
5. Step 5: Solve for x
   x = 3,059,286.49/2,391.76
6. Step 6: Final answer
   x = 1,279.09