Finding the Fourth Proportional to 21,538.54, 29,723.34 and 12,586.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,538.54 : 29,723.34 = 12,586.42 : x
2. Step 2: Convert to fraction form
   21,538.54/29,723.34 = 12,586.42/x
3. Step 3: Cross multiply
   21,538.54x = 29,723.34 × 12,586.42
4. Step 4: Simplify right side
   21,538.54x = 374,110,441.04
5. Step 5: Solve for x
   x = 374,110,441.04/21,538.54
6. Step 6: Final answer
   x = 17,369.35