Finding the Fourth Proportional to 18,669.48, 25,788.42 and 13,945.56

Step by Step Solution

1. Step 1: Write the proportion equation
   18,669.48 : 25,788.42 = 13,945.56 : x
2. Step 2: Convert to fraction form
   18,669.48/25,788.42 = 13,945.56/x
3. Step 3: Cross multiply
   18,669.48x = 25,788.42 × 13,945.56
4. Step 4: Simplify right side
   18,669.48x = 359,633,958.42
5. Step 5: Solve for x
   x = 359,633,958.42/18,669.48
6. Step 6: Final answer
   x = 19,263.20