Finding the Fourth Proportional to 12,906.12, 17,807.73 and 8,436.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.12 : 17,807.73 = 8,436.42 : x
2. Step 2: Convert to fraction form
   12,906.12/17,807.73 = 8,436.42/x
3. Step 3: Cross multiply
   12,906.12x = 17,807.73 × 8,436.42
4. Step 4: Simplify right side
   12,906.12x = 150,233,489.53
5. Step 5: Solve for x
   x = 150,233,489.53/12,906.12
6. Step 6: Final answer
   x = 11,640.48