Finding the Fourth Proportional to 21,588.52, 29,789.76 and 12,156.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,588.52 : 29,789.76 = 12,156.88 : x
2. Step 2: Convert to fraction form
   21,588.52/29,789.76 = 12,156.88/x
3. Step 3: Cross multiply
   21,588.52x = 29,789.76 × 12,156.88
4. Step 4: Simplify right side
   21,588.52x = 362,150,537.55
5. Step 5: Solve for x
   x = 362,150,537.55/21,588.52
6. Step 6: Final answer
   x = 16,775.14