Finding the Fourth Proportional to 18,522.81, 25,561.43 and 10,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   18,522.81 : 25,561.43 = 10,139.25 : x
2. Step 2: Convert to fraction form
   18,522.81/25,561.43 = 10,139.25/x
3. Step 3: Cross multiply
   18,522.81x = 25,561.43 × 10,139.25
4. Step 4: Simplify right side
   18,522.81x = 259,173,678.43
5. Step 5: Solve for x
   x = 259,173,678.43/18,522.81
6. Step 6: Final answer
   x = 13,992.14