Finding the Fourth Proportional to 16,242.89, 22,415.27 and 8,790.89

Step by Step Solution

1. Step 1: Write the proportion equation
   16,242.89 : 22,415.27 = 8,790.89 : x
2. Step 2: Convert to fraction form
   16,242.89/22,415.27 = 8,790.89/x
3. Step 3: Cross multiply
   16,242.89x = 22,415.27 × 8,790.89
4. Step 4: Simplify right side
   16,242.89x = 197,050,016.86
5. Step 5: Solve for x
   x = 197,050,016.86/16,242.89
6. Step 6: Final answer
   x = 12,131.47