Finding the Fourth Proportional to 6,439.77, 8,884.27 and 3,919.86

Step by Step Solution

1. Step 1: Write the proportion equation
   6,439.77 : 8,884.27 = 3,919.86 : x
2. Step 2: Convert to fraction form
   6,439.77/8,884.27 = 3,919.86/x
3. Step 3: Cross multiply
   6,439.77x = 8,884.27 × 3,919.86
4. Step 4: Simplify right side
   6,439.77x = 34,825,094.60
5. Step 5: Solve for x
   x = 34,825,094.60/6,439.77
6. Step 6: Final answer
   x = 5,407.82