Finding the Fourth Proportional to 13,145.28, 19,735.20 and 12,058.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.28 : 19,735.20 = 12,058.56 : x
2. Step 2: Convert to fraction form
   13,145.28/19,735.20 = 12,058.56/x
3. Step 3: Cross multiply
   13,145.28x = 19,735.20 × 12,058.56
4. Step 4: Simplify right side
   13,145.28x = 237,978,093.31
5. Step 5: Solve for x
   x = 237,978,093.31/13,145.28
6. Step 6: Final answer
   x = 18,103.69