Finding the Fourth Proportional to 8,222.72, 12,301.32 and 7,139.84

Step by Step Solution

1. Step 1: Write the proportion equation
   8,222.72 : 12,301.32 = 7,139.84 : x
2. Step 2: Convert to fraction form
   8,222.72/12,301.32 = 7,139.84/x
3. Step 3: Cross multiply
   8,222.72x = 12,301.32 × 7,139.84
4. Step 4: Simplify right side
   8,222.72x = 87,829,456.59
5. Step 5: Solve for x
   x = 87,829,456.59/8,222.72
6. Step 6: Final answer
   x = 10,681.31