Finding the Fourth Proportional to 6,381.60, 8,806.09 and 3,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,381.60 : 8,806.09 = 3,728.72 : x
2. Step 2: Convert to fraction form
   6,381.60/8,806.09 = 3,728.72/x
3. Step 3: Cross multiply
   6,381.60x = 8,806.09 × 3,728.72
4. Step 4: Simplify right side
   6,381.60x = 32,835,443.90
5. Step 5: Solve for x
   x = 32,835,443.90/6,381.60
6. Step 6: Final answer
   x = 5,145.33