Finding the Fourth Proportional to 3,451.21, 5,150.28 and 3,431.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,451.21 : 5,150.28 = 3,431.48 : x
2. Step 2: Convert to fraction form
   3,451.21/5,150.28 = 3,431.48/x
3. Step 3: Cross multiply
   3,451.21x = 5,150.28 × 3,431.48
4. Step 4: Simplify right side
   3,451.21x = 17,673,098.90
5. Step 5: Solve for x
   x = 17,673,098.90/3,451.21
6. Step 6: Final answer
   x = 5,120.85