Finding the Fourth Proportional to 13,992.89, 19,309.59 and 8,020.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,992.89 : 19,309.59 = 8,020.42 : x
2. Step 2: Convert to fraction form
   13,992.89/19,309.59 = 8,020.42/x
3. Step 3: Cross multiply
   13,992.89x = 19,309.59 × 8,020.42
4. Step 4: Simplify right side
   13,992.89x = 154,870,973.55
5. Step 5: Solve for x
   x = 154,870,973.55/13,992.89
6. Step 6: Final answer
   x = 11,067.84