Finding the Fourth Proportional to 21,897, 30,219.48 and 12,468.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897 : 30,219.48 = 12,468.60 : x
2. Step 2: Convert to fraction form
   21,897/30,219.48 = 12,468.60/x
3. Step 3: Cross multiply
   21,897x = 30,219.48 × 12,468.60
4. Step 4: Simplify right side
   21,897x = 376,794,608.33
5. Step 5: Solve for x
   x = 376,794,608.33/21,897
6. Step 6: Final answer
   x = 17,207.59