Finding the Fourth Proportional to 18,523, 25,561.94 and 10,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,523 : 25,561.94 = 10,139.50 : x
2. Step 2: Convert to fraction form
   18,523/25,561.94 = 10,139.50/x
3. Step 3: Cross multiply
   18,523x = 25,561.94 × 10,139.50
4. Step 4: Simplify right side
   18,523x = 259,185,290.63
5. Step 5: Solve for x
   x = 259,185,290.63/18,523
6. Step 6: Final answer
   x = 13,992.62