Finding the Fourth Proportional to 7,222.79, 9,967.37 and 4,078.91

Step by Step Solution

1. Step 1: Write the proportion equation
   7,222.79 : 9,967.37 = 4,078.91 : x
2. Step 2: Convert to fraction form
   7,222.79/9,967.37 = 4,078.91/x
3. Step 3: Cross multiply
   7,222.79x = 9,967.37 × 4,078.91
4. Step 4: Simplify right side
   7,222.79x = 40,655,934.94
5. Step 5: Solve for x
   x = 40,655,934.94/7,222.79
6. Step 6: Final answer
   x = 5,628.84