Finding the Fourth Proportional to 21,985.88, 30,339.78 and 12,426.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,985.88 : 30,339.78 = 12,426.14 : x
2. Step 2: Convert to fraction form
   21,985.88/30,339.78 = 12,426.14/x
3. Step 3: Cross multiply
   21,985.88x = 30,339.78 × 12,426.14
4. Step 4: Simplify right side
   21,985.88x = 377,006,353.85
5. Step 5: Solve for x
   x = 377,006,353.85/21,985.88
6. Step 6: Final answer
   x = 17,147.66