Finding the Fourth Proportional to 18,399, 25,390.71 and 10,015.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,399 : 25,390.71 = 10,015.50 : x
2. Step 2: Convert to fraction form
   18,399/25,390.71 = 10,015.50/x
3. Step 3: Cross multiply
   18,399x = 25,390.71 × 10,015.50
4. Step 4: Simplify right side
   18,399x = 254,300,656.01
5. Step 5: Solve for x
   x = 254,300,656.01/18,399
6. Step 6: Final answer
   x = 13,821.44