Finding the Fourth Proportional to 5,145.72, 7,105.09 and 3,948.81

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.72 : 7,105.09 = 3,948.81 : x
2. Step 2: Convert to fraction form
   5,145.72/7,105.09 = 3,948.81/x
3. Step 3: Cross multiply
   5,145.72x = 7,105.09 × 3,948.81
4. Step 4: Simplify right side
   5,145.72x = 28,056,660.31
5. Step 5: Solve for x
   x = 28,056,660.31/5,145.72
6. Step 6: Final answer
   x = 5,452.43