Finding the Fourth Proportional to 7,111.28, 9,813.76 and 3,968.08

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.28 : 9,813.76 = 3,968.08 : x
2. Step 2: Convert to fraction form
   7,111.28/9,813.76 = 3,968.08/x
3. Step 3: Cross multiply
   7,111.28x = 9,813.76 × 3,968.08
4. Step 4: Simplify right side
   7,111.28x = 38,941,784.78
5. Step 5: Solve for x
   x = 38,941,784.78/7,111.28
6. Step 6: Final answer
   x = 5,476.06