Finding the Fourth Proportional to 12,805.50, 17,671.59 and 7,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,805.50 : 17,671.59 = 7,216.50 : x
2. Step 2: Convert to fraction form
   12,805.50/17,671.59 = 7,216.50/x
3. Step 3: Cross multiply
   12,805.50x = 17,671.59 × 7,216.50
4. Step 4: Simplify right side
   12,805.50x = 127,527,029.24
5. Step 5: Solve for x
   x = 127,527,029.24/12,805.50
6. Step 6: Final answer
   x = 9,958.77