Finding the Fourth Proportional to 3,738.56, 5,155.20 and 2,479.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,738.56 : 5,155.20 = 2,479.21 : x
2. Step 2: Convert to fraction form
   3,738.56/5,155.20 = 2,479.21/x
3. Step 3: Cross multiply
   3,738.56x = 5,155.20 × 2,479.21
4. Step 4: Simplify right side
   3,738.56x = 12,780,810.50
5. Step 5: Solve for x
   x = 12,780,810.50/3,738.56
6. Step 6: Final answer
   x = 3,418.65