Finding the Fourth Proportional to 12,933.81, 19,287.52 and 12,815.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,933.81 : 19,287.52 = 12,815.57 : x
2. Step 2: Convert to fraction form
   12,933.81/19,287.52 = 12,815.57/x
3. Step 3: Cross multiply
   12,933.81x = 19,287.52 × 12,815.57
4. Step 4: Simplify right side
   12,933.81x = 247,180,562.69
5. Step 5: Solve for x
   x = 247,180,562.69/12,933.81
6. Step 6: Final answer
   x = 19,111.19