Finding the Fourth Proportional to 21,898, 30,219.24 and 12,472.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,898 : 30,219.24 = 12,472.12 : x
2. Step 2: Convert to fraction form
   21,898/30,219.24 = 12,472.12/x
3. Step 3: Cross multiply
   21,898x = 30,219.24 × 12,472.12
4. Step 4: Simplify right side
   21,898x = 376,897,987.59
5. Step 5: Solve for x
   x = 376,897,987.59/21,898
6. Step 6: Final answer
   x = 17,211.53