Finding the Fourth Proportional to 21,588.40, 29,791.41 and 12,156.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,588.40 : 29,791.41 = 12,156.76 : x
2. Step 2: Convert to fraction form
   21,588.40/29,791.41 = 12,156.76/x
3. Step 3: Cross multiply
   21,588.40x = 29,791.41 × 12,156.76
4. Step 4: Simplify right side
   21,588.40x = 362,167,021.43
5. Step 5: Solve for x
   x = 362,167,021.43/21,588.40
6. Step 6: Final answer
   x = 16,776.00