Finding the Fourth Proportional to 21,634.72, 29,855.76 and 12,559.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,634.72 : 29,855.76 = 12,559.35 : x
2. Step 2: Convert to fraction form
   21,634.72/29,855.76 = 12,559.35/x
3. Step 3: Cross multiply
   21,634.72x = 29,855.76 × 12,559.35
4. Step 4: Simplify right side
   21,634.72x = 374,969,110.19
5. Step 5: Solve for x
   x = 374,969,110.19/21,634.72
6. Step 6: Final answer
   x = 17,331.82