Finding the Fourth Proportional to 3,811.88, 5,725.33 and 3,647.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,811.88 : 5,725.33 = 3,647.85 : x
2. Step 2: Convert to fraction form
   3,811.88/5,725.33 = 3,647.85/x
3. Step 3: Cross multiply
   3,811.88x = 5,725.33 × 3,647.85
4. Step 4: Simplify right side
   3,811.88x = 20,885,167.18
5. Step 5: Solve for x
   x = 20,885,167.18/3,811.88
6. Step 6: Final answer
   x = 5,478.97