Finding the Fourth Proportional to 3,851.39, 5,315.28 and 2,279.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.39 : 5,315.28 = 2,279.72 : x
2. Step 2: Convert to fraction form
   3,851.39/5,315.28 = 2,279.72/x
3. Step 3: Cross multiply
   3,851.39x = 5,315.28 × 2,279.72
4. Step 4: Simplify right side
   3,851.39x = 12,117,350.12
5. Step 5: Solve for x
   x = 12,117,350.12/3,851.39
6. Step 6: Final answer
   x = 3,146.23