Finding the Fourth Proportional to 3,421.58, 5,129.33 and 1,229.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,421.58 : 5,129.33 = 1,229.72 : x
2. Step 2: Convert to fraction form
   3,421.58/5,129.33 = 1,229.72/x
3. Step 3: Cross multiply
   3,421.58x = 5,129.33 × 1,229.72
4. Step 4: Simplify right side
   3,421.58x = 6,307,607.89
5. Step 5: Solve for x
   x = 6,307,607.89/3,421.58
6. Step 6: Final answer
   x = 1,843.48