Finding the Fourth Proportional to 7,113.77, 9,816.41 and 3,969.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,113.77 : 9,816.41 = 3,969.89 : x
2. Step 2: Convert to fraction form
   7,113.77/9,816.41 = 3,969.89/x
3. Step 3: Cross multiply
   7,113.77x = 9,816.41 × 3,969.89
4. Step 4: Simplify right side
   7,113.77x = 38,970,067.89
5. Step 5: Solve for x
   x = 38,970,067.89/7,113.77
6. Step 6: Final answer
   x = 5,478.12