Finding the Fourth Proportional to 6,390.15, 8,819.72 and 3,738.21

Step by Step Solution

1. Step 1: Write the proportion equation
   6,390.15 : 8,819.72 = 3,738.21 : x
2. Step 2: Convert to fraction form
   6,390.15/8,819.72 = 3,738.21/x
3. Step 3: Cross multiply
   6,390.15x = 8,819.72 × 3,738.21
4. Step 4: Simplify right side
   6,390.15x = 32,969,946.81
5. Step 5: Solve for x
   x = 32,969,946.81/6,390.15
6. Step 6: Final answer
   x = 5,159.49