Finding the Fourth Proportional to 9,222.06, 12,722.79 and 5,679.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,222.06 : 12,722.79 = 5,679.12 : x
2. Step 2: Convert to fraction form
   9,222.06/12,722.79 = 5,679.12/x
3. Step 3: Cross multiply
   9,222.06x = 12,722.79 × 5,679.12
4. Step 4: Simplify right side
   9,222.06x = 72,254,251.14
5. Step 5: Solve for x
   x = 72,254,251.14/9,222.06
6. Step 6: Final answer
   x = 7,834.94