Finding the Fourth Proportional to 16,769.55, 23,140.86 and 9,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,769.55 : 23,140.86 = 9,215.72 : x
2. Step 2: Convert to fraction form
   16,769.55/23,140.86 = 9,215.72/x
3. Step 3: Cross multiply
   16,769.55x = 23,140.86 × 9,215.72
4. Step 4: Simplify right side
   16,769.55x = 213,259,570.61
5. Step 5: Solve for x
   x = 213,259,570.61/16,769.55
6. Step 6: Final answer
   x = 12,717.07