Finding the Fourth Proportional to 21,865.38, 30,171.78 and 12,303.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,865.38 : 30,171.78 = 12,303.42 : x
2. Step 2: Convert to fraction form
   21,865.38/30,171.78 = 12,303.42/x
3. Step 3: Cross multiply
   21,865.38x = 30,171.78 × 12,303.42
4. Step 4: Simplify right side
   21,865.38x = 371,216,081.49
5. Step 5: Solve for x
   x = 371,216,081.49/21,865.38
6. Step 6: Final answer
   x = 16,977.34