Finding the Fourth Proportional to 12,811.69, 17,680.13 and 7,222.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,811.69 : 17,680.13 = 7,222.69 : x
2. Step 2: Convert to fraction form
   12,811.69/17,680.13 = 7,222.69/x
3. Step 3: Cross multiply
   12,811.69x = 17,680.13 × 7,222.69
4. Step 4: Simplify right side
   12,811.69x = 127,698,072.01
5. Step 5: Solve for x
   x = 127,698,072.01/12,811.69
6. Step 6: Final answer
   x = 9,967.31