Finding the Fourth Proportional to 21,128.25, 29,159.02 and 11,696.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,128.25 : 29,159.02 = 11,696.82 : x
2. Step 2: Convert to fraction form
   21,128.25/29,159.02 = 11,696.82/x
3. Step 3: Cross multiply
   21,128.25x = 29,159.02 × 11,696.82
4. Step 4: Simplify right side
   21,128.25x = 341,067,808.32
5. Step 5: Solve for x
   x = 341,067,808.32/21,128.25
6. Step 6: Final answer
   x = 16,142.74