Finding the Fourth Proportional to 7,142.31, 10,717.52 and 3,855.33

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.31 : 10,717.52 = 3,855.33 : x
2. Step 2: Convert to fraction form
   7,142.31/10,717.52 = 3,855.33/x
3. Step 3: Cross multiply
   7,142.31x = 10,717.52 × 3,855.33
4. Step 4: Simplify right side
   7,142.31x = 41,319,557.10
5. Step 5: Solve for x
   x = 41,319,557.10/7,142.31
6. Step 6: Final answer
   x = 5,785.18