Finding the Fourth Proportional to 21,128.34, 29,156.04 and 11,697.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,128.34 : 29,156.04 = 11,697.52 : x
2. Step 2: Convert to fraction form
   21,128.34/29,156.04 = 11,697.52/x
3. Step 3: Cross multiply
   21,128.34x = 29,156.04 × 11,697.52
4. Step 4: Simplify right side
   21,128.34x = 341,053,361.02
5. Step 5: Solve for x
   x = 341,053,361.02/21,128.34
6. Step 6: Final answer
   x = 16,141.99