Finding the Fourth Proportional to 21,162.50, 31,754.15 and 8,511.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.50 : 31,754.15 = 8,511.74 : x
2. Step 2: Convert to fraction form
   21,162.50/31,754.15 = 8,511.74/x
3. Step 3: Cross multiply
   21,162.50x = 31,754.15 × 8,511.74
4. Step 4: Simplify right side
   21,162.50x = 270,283,105.55
5. Step 5: Solve for x
   x = 270,283,105.55/21,162.50
6. Step 6: Final answer
   x = 12,771.80