Finding the Fourth Proportional to 15,311.89, 21,148.24 and 12,256.38

Step by Step Solution

1. Step 1: Write the proportion equation
   15,311.89 : 21,148.24 = 12,256.38 : x
2. Step 2: Convert to fraction form
   15,311.89/21,148.24 = 12,256.38/x
3. Step 3: Cross multiply
   15,311.89x = 21,148.24 × 12,256.38
4. Step 4: Simplify right side
   15,311.89x = 259,200,865.77
5. Step 5: Solve for x
   x = 259,200,865.77/15,311.89
6. Step 6: Final answer
   x = 16,928.08