Finding the Fourth Proportional to 21,834.54, 30,105.99 and 18,257.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,834.54 : 30,105.99 = 18,257.58 : x
2. Step 2: Convert to fraction form
   21,834.54/30,105.99 = 18,257.58/x
3. Step 3: Cross multiply
   21,834.54x = 30,105.99 × 18,257.58
4. Step 4: Simplify right side
   21,834.54x = 549,662,520.90
5. Step 5: Solve for x
   x = 549,662,520.90/21,834.54
6. Step 6: Final answer
   x = 25,173.99