Finding the Fourth Proportional to 21,589.96, 29,796.88 and 12,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,589.96 : 29,796.88 = 12,158.50 : x
2. Step 2: Convert to fraction form
   21,589.96/29,796.88 = 12,158.50/x
3. Step 3: Cross multiply
   21,589.96x = 29,796.88 × 12,158.50
4. Step 4: Simplify right side
   21,589.96x = 362,285,365.48
5. Step 5: Solve for x
   x = 362,285,365.48/21,589.96
6. Step 6: Final answer
   x = 16,780.27