Finding the Fourth Proportional to 21,836.76, 30,131.10 and 12,401.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,836.76 : 30,131.10 = 12,401.88 : x
2. Step 2: Convert to fraction form
   21,836.76/30,131.10 = 12,401.88/x
3. Step 3: Cross multiply
   21,836.76x = 30,131.10 × 12,401.88
4. Step 4: Simplify right side
   21,836.76x = 373,682,286.47
5. Step 5: Solve for x
   x = 373,682,286.47/21,836.76
6. Step 6: Final answer
   x = 17,112.53