Finding the Fourth Proportional to 21,093.37, 31,689.27 and 12,334.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.37 : 31,689.27 = 12,334.43 : x
2. Step 2: Convert to fraction form
   21,093.37/31,689.27 = 12,334.43/x
3. Step 3: Cross multiply
   21,093.37x = 31,689.27 × 12,334.43
4. Step 4: Simplify right side
   21,093.37x = 390,869,161.79
5. Step 5: Solve for x
   x = 390,869,161.79/21,093.37
6. Step 6: Final answer
   x = 18,530.43