Finding the Fourth Proportional to 5,147.25, 7,103.56 and 3,131.45

Step by Step Solution

1. Step 1: Write the proportion equation
   5,147.25 : 7,103.56 = 3,131.45 : x
2. Step 2: Convert to fraction form
   5,147.25/7,103.56 = 3,131.45/x
3. Step 3: Cross multiply
   5,147.25x = 7,103.56 × 3,131.45
4. Step 4: Simplify right side
   5,147.25x = 22,244,442.96
5. Step 5: Solve for x
   x = 22,244,442.96/5,147.25
6. Step 6: Final answer
   x = 4,321.62