Finding the Fourth Proportional to 7,111.97, 9,812.22 and 3,967.55

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.97 : 9,812.22 = 3,967.55 : x
2. Step 2: Convert to fraction form
   7,111.97/9,812.22 = 3,967.55/x
3. Step 3: Cross multiply
   7,111.97x = 9,812.22 × 3,967.55
4. Step 4: Simplify right side
   7,111.97x = 38,930,473.46
5. Step 5: Solve for x
   x = 38,930,473.46/7,111.97
6. Step 6: Final answer
   x = 5,473.94