Finding the Fourth Proportional to 6,391.88, 8,819.46 and 3,738.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391.88 : 8,819.46 = 3,738.78 : x
2. Step 2: Convert to fraction form
   6,391.88/8,819.46 = 3,738.78/x
3. Step 3: Cross multiply
   6,391.88x = 8,819.46 × 3,738.78
4. Step 4: Simplify right side
   6,391.88x = 32,974,020.66
5. Step 5: Solve for x
   x = 32,974,020.66/6,391.88
6. Step 6: Final answer
   x = 5,158.74