Finding the Fourth Proportional to 6,405.28, 8,839.29 and 3,886.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,405.28 : 8,839.29 = 3,886.72 : x
2. Step 2: Convert to fraction form
   6,405.28/8,839.29 = 3,886.72/x
3. Step 3: Cross multiply
   6,405.28x = 8,839.29 × 3,886.72
4. Step 4: Simplify right side
   6,405.28x = 34,355,845.23
5. Step 5: Solve for x
   x = 34,355,845.23/6,405.28
6. Step 6: Final answer
   x = 5,363.68