Finding the Fourth Proportional to 20,648.30, 28,496.55 and 11,696.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,648.30 : 28,496.55 = 11,696.18 : x
2. Step 2: Convert to fraction form
   20,648.30/28,496.55 = 11,696.18/x
3. Step 3: Cross multiply
   20,648.30x = 28,496.55 × 11,696.18
4. Step 4: Simplify right side
   20,648.30x = 333,300,635.70
5. Step 5: Solve for x
   x = 333,300,635.70/20,648.30
6. Step 6: Final answer
   x = 16,141.80