Finding the Fourth Proportional to 12,801.82, 19,211.43 and 7,856.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,801.82 : 19,211.43 = 7,856.37 : x
2. Step 2: Convert to fraction form
   12,801.82/19,211.43 = 7,856.37/x
3. Step 3: Cross multiply
   12,801.82x = 19,211.43 × 7,856.37
4. Step 4: Simplify right side
   12,801.82x = 150,932,102.31
5. Step 5: Solve for x
   x = 150,932,102.31/12,801.82
6. Step 6: Final answer
   x = 11,789.89