Finding the Fourth Proportional to 21,897, 30,217.89 and 12,465.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897 : 30,217.89 = 12,465.56 : x
2. Step 2: Convert to fraction form
   21,897/30,217.89 = 12,465.56/x
3. Step 3: Cross multiply
   21,897x = 30,217.89 × 12,465.56
4. Step 4: Simplify right side
   21,897x = 376,683,043.16
5. Step 5: Solve for x
   x = 376,683,043.16/21,897
6. Step 6: Final answer
   x = 17,202.50