Finding the Fourth Proportional to 3,856.28, 5,754.15 and 3,621.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.28 : 5,754.15 = 3,621.20 : x
2. Step 2: Convert to fraction form
   3,856.28/5,754.15 = 3,621.20/x
3. Step 3: Cross multiply
   3,856.28x = 5,754.15 × 3,621.20
4. Step 4: Simplify right side
   3,856.28x = 20,836,927.98
5. Step 5: Solve for x
   x = 20,836,927.98/3,856.28
6. Step 6: Final answer
   x = 5,403.38