Finding the Fourth Proportional to 12,855.33, 17,740.59 and 7,819.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,855.33 : 17,740.59 = 7,819.76 : x
2. Step 2: Convert to fraction form
   12,855.33/17,740.59 = 7,819.76/x
3. Step 3: Cross multiply
   12,855.33x = 17,740.59 × 7,819.76
4. Step 4: Simplify right side
   12,855.33x = 138,727,067.36
5. Step 5: Solve for x
   x = 138,727,067.36/12,855.33
6. Step 6: Final answer
   x = 10,791.40