Finding the Fourth Proportional to 3,856.56, 5,325.12 and 3,561.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.56 : 5,325.12 = 3,561.72 : x
2. Step 2: Convert to fraction form
   3,856.56/5,325.12 = 3,561.72/x
3. Step 3: Cross multiply
   3,856.56x = 5,325.12 × 3,561.72
4. Step 4: Simplify right side
   3,856.56x = 18,966,586.41
5. Step 5: Solve for x
   x = 18,966,586.41/3,856.56
6. Step 6: Final answer
   x = 4,918.01