Finding the Fourth Proportional to 18,216.89, 25,139.39 and 10,259.25

Step by Step Solution

1. Step 1: Write the proportion equation
   18,216.89 : 25,139.39 = 10,259.25 : x
2. Step 2: Convert to fraction form
   18,216.89/25,139.39 = 10,259.25/x
3. Step 3: Cross multiply
   18,216.89x = 25,139.39 × 10,259.25
4. Step 4: Simplify right side
   18,216.89x = 257,911,235.56
5. Step 5: Solve for x
   x = 257,911,235.56/18,216.89
6. Step 6: Final answer
   x = 14,157.81