Finding the Fourth Proportional to 12,906.16, 17,807.78 and 8,436.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.16 : 17,807.78 = 8,436.49 : x
2. Step 2: Convert to fraction form
   12,906.16/17,807.78 = 8,436.49/x
3. Step 3: Cross multiply
   12,906.16x = 17,807.78 × 8,436.49
4. Step 4: Simplify right side
   12,906.16x = 150,235,134.46
5. Step 5: Solve for x
   x = 150,235,134.46/12,906.16
6. Step 6: Final answer
   x = 11,640.58