Finding the Fourth Proportional to 12,800.76, 17,665.02 and 7,211.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,800.76 : 17,665.02 = 7,211.72 : x
2. Step 2: Convert to fraction form
   12,800.76/17,665.02 = 7,211.72/x
3. Step 3: Cross multiply
   12,800.76x = 17,665.02 × 7,211.72
4. Step 4: Simplify right side
   12,800.76x = 127,395,178.03
5. Step 5: Solve for x
   x = 127,395,178.03/12,800.76
6. Step 6: Final answer
   x = 9,952.16