Finding the Fourth Proportional to 20,196.60, 27,885 and 12,645.96

Step by Step Solution

1. Step 1: Write the proportion equation
   20,196.60 : 27,885 = 12,645.96 : x
2. Step 2: Convert to fraction form
   20,196.60/27,885 = 12,645.96/x
3. Step 3: Cross multiply
   20,196.60x = 27,885 × 12,645.96
4. Step 4: Simplify right side
   20,196.60x = 352,632,594.60
5. Step 5: Solve for x
   x = 352,632,594.60/20,196.60
6. Step 6: Final answer
   x = 17,460.00