Finding the Fourth Proportional to 21,093.43, 31,689.35 and 12,334.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.43 : 31,689.35 = 12,334.50 : x
2. Step 2: Convert to fraction form
   21,093.43/31,689.35 = 12,334.50/x
3. Step 3: Cross multiply
   21,093.43x = 31,689.35 × 12,334.50
4. Step 4: Simplify right side
   21,093.43x = 390,872,287.58
5. Step 5: Solve for x
   x = 390,872,287.58/21,093.43
6. Step 6: Final answer
   x = 18,530.52