Finding the Fourth Proportional to 3,816.96, 5,265.72 and 3,145.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,816.96 : 5,265.72 = 3,145.20 : x
2. Step 2: Convert to fraction form
   3,816.96/5,265.72 = 3,145.20/x
3. Step 3: Cross multiply
   3,816.96x = 5,265.72 × 3,145.20
4. Step 4: Simplify right side
   3,816.96x = 16,561,742.54
5. Step 5: Solve for x
   x = 16,561,742.54/3,816.96
6. Step 6: Final answer
   x = 4,338.99