Finding the Fourth Proportional to 12,818.53, 19,228.39 and 3,933.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.53 : 19,228.39 = 3,933.21 : x
2. Step 2: Convert to fraction form
   12,818.53/19,228.39 = 3,933.21/x
3. Step 3: Cross multiply
   12,818.53x = 19,228.39 × 3,933.21
4. Step 4: Simplify right side
   12,818.53x = 75,629,249.95
5. Step 5: Solve for x
   x = 75,629,249.95/12,818.53
6. Step 6: Final answer
   x = 5,899.99