Finding the Fourth Proportional to 21,156.69, 29,196.18 and 11,725.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156.69 : 29,196.18 = 11,725.32 : x
2. Step 2: Convert to fraction form
   21,156.69/29,196.18 = 11,725.32/x
3. Step 3: Cross multiply
   21,156.69x = 29,196.18 × 11,725.32
4. Step 4: Simplify right side
   21,156.69x = 342,334,553.28
5. Step 5: Solve for x
   x = 342,334,553.28/21,156.69
6. Step 6: Final answer
   x = 16,180.91