Finding the Fourth Proportional to 3,900.42, 5,382.18 and 2,328.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.42 : 5,382.18 = 2,328.30 : x
2. Step 2: Convert to fraction form
   3,900.42/5,382.18 = 2,328.30/x
3. Step 3: Cross multiply
   3,900.42x = 5,382.18 × 2,328.30
4. Step 4: Simplify right side
   3,900.42x = 12,531,329.69
5. Step 5: Solve for x
   x = 12,531,329.69/3,900.42
6. Step 6: Final answer
   x = 3,212.82