Finding the Fourth Proportional to 3,429.21, 5,145.55 and 1,455.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,429.21 : 5,145.55 = 1,455.34 : x
2. Step 2: Convert to fraction form
   3,429.21/5,145.55 = 1,455.34/x
3. Step 3: Cross multiply
   3,429.21x = 5,145.55 × 1,455.34
4. Step 4: Simplify right side
   3,429.21x = 7,488,536.45
5. Step 5: Solve for x
   x = 7,488,536.45/3,429.21
6. Step 6: Final answer
   x = 2,183.75