Finding the Fourth Proportional to 18,196.80, 25,109.55 and 10,238.85

Step by Step Solution

1. Step 1: Write the proportion equation
   18,196.80 : 25,109.55 = 10,238.85 : x
2. Step 2: Convert to fraction form
   18,196.80/25,109.55 = 10,238.85/x
3. Step 3: Cross multiply
   18,196.80x = 25,109.55 × 10,238.85
4. Step 4: Simplify right side
   18,196.80x = 257,092,916.02
5. Step 5: Solve for x
   x = 257,092,916.02/18,196.80
6. Step 6: Final answer
   x = 14,128.47