Finding the Fourth Proportional to 21,591.42, 29,795.01 and 12,159.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,591.42 : 29,795.01 = 12,159.38 : x
2. Step 2: Convert to fraction form
   21,591.42/29,795.01 = 12,159.38/x
3. Step 3: Cross multiply
   21,591.42x = 29,795.01 × 12,159.38
4. Step 4: Simplify right side
   21,591.42x = 362,288,699.72
5. Step 5: Solve for x
   x = 362,288,699.72/21,591.42
6. Step 6: Final answer
   x = 16,779.29