Finding the Fourth Proportional to 20,695.40, 28,559.33 and 12,196.17

Step by Step Solution

1. Step 1: Write the proportion equation
   20,695.40 : 28,559.33 = 12,196.17 : x
2. Step 2: Convert to fraction form
   20,695.40/28,559.33 = 12,196.17/x
3. Step 3: Cross multiply
   20,695.40x = 28,559.33 × 12,196.17
4. Step 4: Simplify right side
   20,695.40x = 348,314,382.79
5. Step 5: Solve for x
   x = 348,314,382.79/20,695.40
6. Step 6: Final answer
   x = 16,830.53