Finding the Fourth Proportional to 21,155.29, 31,736.59 and 7,116.68

Step by Step Solution

1. Step 1: Write the proportion equation
   21,155.29 : 31,736.59 = 7,116.68 : x
2. Step 2: Convert to fraction form
   21,155.29/31,736.59 = 7,116.68/x
3. Step 3: Cross multiply
   21,155.29x = 31,736.59 × 7,116.68
4. Step 4: Simplify right side
   21,155.29x = 225,859,078.38
5. Step 5: Solve for x
   x = 225,859,078.38/21,155.29
6. Step 6: Final answer
   x = 10,676.24