Finding the Fourth Proportional to 5,476.36, 8,216.57 and 3,928.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,476.36 : 8,216.57 = 3,928.72 : x
2. Step 2: Convert to fraction form
   5,476.36/8,216.57 = 3,928.72/x
3. Step 3: Cross multiply
   5,476.36x = 8,216.57 × 3,928.72
4. Step 4: Simplify right side
   5,476.36x = 32,280,602.89
5. Step 5: Solve for x
   x = 32,280,602.89/5,476.36
6. Step 6: Final answer
   x = 5,894.54