Finding the Fourth Proportional to 12,800.82, 19,209.93 and 7,855.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,800.82 : 19,209.93 = 7,855.37 : x
2. Step 2: Convert to fraction form
   12,800.82/19,209.93 = 7,855.37/x
3. Step 3: Cross multiply
   12,800.82x = 19,209.93 × 7,855.37
4. Step 4: Simplify right side
   12,800.82x = 150,901,011.77
5. Step 5: Solve for x
   x = 150,901,011.77/12,800.82
6. Step 6: Final answer
   x = 11,788.39