Finding the Fourth Proportional to 6,078.76, 8,390.28 and 3,960.10

Step by Step Solution

1. Step 1: Write the proportion equation
   6,078.76 : 8,390.28 = 3,960.10 : x
2. Step 2: Convert to fraction form
   6,078.76/8,390.28 = 3,960.10/x
3. Step 3: Cross multiply
   6,078.76x = 8,390.28 × 3,960.10
4. Step 4: Simplify right side
   6,078.76x = 33,226,328.03
5. Step 5: Solve for x
   x = 33,226,328.03/6,078.76
6. Step 6: Final answer
   x = 5,465.98