Finding the Fourth Proportional to 25,641.20, 38,456.91 and 10,860.50

Step by Step Solution

1. Step 1: Write the proportion equation
   25,641.20 : 38,456.91 = 10,860.50 : x
2. Step 2: Convert to fraction form
   25,641.20/38,456.91 = 10,860.50/x
3. Step 3: Cross multiply
   25,641.20x = 38,456.91 × 10,860.50
4. Step 4: Simplify right side
   25,641.20x = 417,661,078.77
5. Step 5: Solve for x
   x = 417,661,078.77/25,641.20
6. Step 6: Final answer
   x = 16,288.67