Finding the Fourth Proportional to 21,836.59, 30,134.60 and 12,405.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,836.59 : 30,134.60 = 12,405.67 : x
2. Step 2: Convert to fraction form
   21,836.59/30,134.60 = 12,405.67/x
3. Step 3: Cross multiply
   21,836.59x = 30,134.60 × 12,405.67
4. Step 4: Simplify right side
   21,836.59x = 373,839,841.15
5. Step 5: Solve for x
   x = 373,839,841.15/21,836.59
6. Step 6: Final answer
   x = 17,119.88