Finding the Fourth Proportional to 3,881.69, 5,357.17 and 2,309.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,881.69 : 5,357.17 = 2,309.78 : x
2. Step 2: Convert to fraction form
   3,881.69/5,357.17 = 2,309.78/x
3. Step 3: Cross multiply
   3,881.69x = 5,357.17 × 2,309.78
4. Step 4: Simplify right side
   3,881.69x = 12,373,900.40
5. Step 5: Solve for x
   x = 12,373,900.40/3,881.69
6. Step 6: Final answer
   x = 3,187.76