Finding the Fourth Proportional to 12,123.81, 18,161.64 and 9,340.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.81 : 18,161.64 = 9,340.83 : x
2. Step 2: Convert to fraction form
   12,123.81/18,161.64 = 9,340.83/x
3. Step 3: Cross multiply
   12,123.81x = 18,161.64 × 9,340.83
4. Step 4: Simplify right side
   12,123.81x = 169,644,791.76
5. Step 5: Solve for x
   x = 169,644,791.76/12,123.81
6. Step 6: Final answer
   x = 13,992.70