Finding the Fourth Proportional to 21,895.89, 30,206.73 and 13,398.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,895.89 : 30,206.73 = 13,398.42 : x
2. Step 2: Convert to fraction form
   21,895.89/30,206.73 = 13,398.42/x
3. Step 3: Cross multiply
   21,895.89x = 30,206.73 × 13,398.42
4. Step 4: Simplify right side
   21,895.89x = 404,722,455.37
5. Step 5: Solve for x
   x = 404,722,455.37/21,895.89
6. Step 6: Final answer
   x = 18,483.95