Finding the Fourth Proportional to 21,766.94, 30,036.92 and 12,816.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,766.94 : 30,036.92 = 12,816.18 : x
2. Step 2: Convert to fraction form
   21,766.94/30,036.92 = 12,816.18/x
3. Step 3: Cross multiply
   21,766.94x = 30,036.92 × 12,816.18
4. Step 4: Simplify right side
   21,766.94x = 384,958,573.37
5. Step 5: Solve for x
   x = 384,958,573.37/21,766.94
6. Step 6: Final answer
   x = 17,685.47