Finding the Fourth Proportional to 21,586.50, 29,789.46 and 12,155.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,586.50 : 29,789.46 = 12,155.22 : x
2. Step 2: Convert to fraction form
   21,586.50/29,789.46 = 12,155.22/x
3. Step 3: Cross multiply
   21,586.50x = 29,789.46 × 12,155.22
4. Step 4: Simplify right side
   21,586.50x = 362,097,439.98
5. Step 5: Solve for x
   x = 362,097,439.98/21,586.50
6. Step 6: Final answer
   x = 16,774.25