Finding the Fourth Proportional to 21,789.15, 30,058.56 and 13,817.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.15 : 30,058.56 = 13,817.49 : x
2. Step 2: Convert to fraction form
   21,789.15/30,058.56 = 13,817.49/x
3. Step 3: Cross multiply
   21,789.15x = 30,058.56 × 13,817.49
4. Step 4: Simplify right side
   21,789.15x = 415,333,852.21
5. Step 5: Solve for x
   x = 415,333,852.21/21,789.15
6. Step 6: Final answer
   x = 19,061.50