Finding the Fourth Proportional to 3,818.53, 5,684.38 and 3,639.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,818.53 : 5,684.38 = 3,639.61 : x
2. Step 2: Convert to fraction form
   3,818.53/5,684.38 = 3,639.61/x
3. Step 3: Cross multiply
   3,818.53x = 5,684.38 × 3,639.61
4. Step 4: Simplify right side
   3,818.53x = 20,688,926.29
5. Step 5: Solve for x
   x = 20,688,926.29/3,818.53
6. Step 6: Final answer
   x = 5,418.03