Finding the Fourth Proportional to 21,897.77, 30,217.34 and 13,401.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897.77 : 30,217.34 = 13,401.28 : x
2. Step 2: Convert to fraction form
   21,897.77/30,217.34 = 13,401.28/x
3. Step 3: Cross multiply
   21,897.77x = 30,217.34 × 13,401.28
4. Step 4: Simplify right side
   21,897.77x = 404,950,816.10
5. Step 5: Solve for x
   x = 404,950,816.10/21,897.77
6. Step 6: Final answer
   x = 18,492.79