Finding the Fourth Proportional to 21,918.72, 30,243.36 and 12,484.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,918.72 : 30,243.36 = 12,484.80 : x
2. Step 2: Convert to fraction form
   21,918.72/30,243.36 = 12,484.80/x
3. Step 3: Cross multiply
   21,918.72x = 30,243.36 × 12,484.80
4. Step 4: Simplify right side
   21,918.72x = 377,582,300.93
5. Step 5: Solve for x
   x = 377,582,300.93/21,918.72
6. Step 6: Final answer
   x = 17,226.48