Finding the Fourth Proportional to 21,914.50, 30,239.60 and 13,418.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,914.50 : 30,239.60 = 13,418.76 : x
2. Step 2: Convert to fraction form
   21,914.50/30,239.60 = 13,418.76/x
3. Step 3: Cross multiply
   21,914.50x = 30,239.60 × 13,418.76
4. Step 4: Simplify right side
   21,914.50x = 405,778,094.42
5. Step 5: Solve for x
   x = 405,778,094.42/21,914.50
6. Step 6: Final answer
   x = 18,516.42