Finding the Fourth Proportional to 21,797.55, 30,079.71 and 12,367.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,797.55 : 30,079.71 = 12,367.89 : x
2. Step 2: Convert to fraction form
   21,797.55/30,079.71 = 12,367.89/x
3. Step 3: Cross multiply
   21,797.55x = 30,079.71 × 12,367.89
4. Step 4: Simplify right side
   21,797.55x = 372,022,544.51
5. Step 5: Solve for x
   x = 372,022,544.51/21,797.55
6. Step 6: Final answer
   x = 17,067.17