Finding the Fourth Proportional to 21,913.40, 30,240.42 and 12,483.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,913.40 : 30,240.42 = 12,483.56 : x
2. Step 2: Convert to fraction form
   21,913.40/30,240.42 = 12,483.56/x
3. Step 3: Cross multiply
   21,913.40x = 30,240.42 × 12,483.56
4. Step 4: Simplify right side
   21,913.40x = 377,508,097.50
5. Step 5: Solve for x
   x = 377,508,097.50/21,913.40
6. Step 6: Final answer
   x = 17,227.27