Finding the Fourth Proportional to 18,105.78, 24,987.15 and 10,039.79

Step by Step Solution

1. Step 1: Write the proportion equation
   18,105.78 : 24,987.15 = 10,039.79 : x
2. Step 2: Convert to fraction form
   18,105.78/24,987.15 = 10,039.79/x
3. Step 3: Cross multiply
   18,105.78x = 24,987.15 × 10,039.79
4. Step 4: Simplify right side
   18,105.78x = 250,865,613.76
5. Step 5: Solve for x
   x = 250,865,613.76/18,105.78
6. Step 6: Final answer
   x = 13,855.55