Finding the Fourth Proportional to 13,121.82, 18,111.03 and 8,340.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,121.82 : 18,111.03 = 8,340.83 : x
2. Step 2: Convert to fraction form
   13,121.82/18,111.03 = 8,340.83/x
3. Step 3: Cross multiply
   13,121.82x = 18,111.03 × 8,340.83
4. Step 4: Simplify right side
   13,121.82x = 151,061,089.75
5. Step 5: Solve for x
   x = 151,061,089.75/13,121.82
6. Step 6: Final answer
   x = 11,512.20