Finding the Fourth Proportional to 3,989.86, 5,482.88 and 3,806.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.86 : 5,482.88 = 3,806.92 : x
2. Step 2: Convert to fraction form
   3,989.86/5,482.88 = 3,806.92/x
3. Step 3: Cross multiply
   3,989.86x = 5,482.88 × 3,806.92
4. Step 4: Simplify right side
   3,989.86x = 20,872,862.31
5. Step 5: Solve for x
   x = 20,872,862.31/3,989.86
6. Step 6: Final answer
   x = 5,231.48