Finding the Fourth Proportional to 18,522.50, 25,561.05 and 10,139

Step by Step Solution

1. Step 1: Write the proportion equation
   18,522.50 : 25,561.05 = 10,139 : x
2. Step 2: Convert to fraction form
   18,522.50/25,561.05 = 10,139/x
3. Step 3: Cross multiply
   18,522.50x = 25,561.05 × 10,139
4. Step 4: Simplify right side
   18,522.50x = 259,163,485.95
5. Step 5: Solve for x
   x = 259,163,485.95/18,522.50
6. Step 6: Final answer
   x = 13,991.82