Finding the Fourth Proportional to 12,942.93, 17,865.09 and 8,405.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.93 : 17,865.09 = 8,405.49 : x
2. Step 2: Convert to fraction form
   12,942.93/17,865.09 = 8,405.49/x
3. Step 3: Cross multiply
   12,942.93x = 17,865.09 × 8,405.49
4. Step 4: Simplify right side
   12,942.93x = 150,164,835.34
5. Step 5: Solve for x
   x = 150,164,835.34/12,942.93
6. Step 6: Final answer
   x = 11,602.07