Finding the Fourth Proportional to 2,421.32, 3,629.46 and 1,121.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.32 : 3,629.46 = 1,121.72 : x
2. Step 2: Convert to fraction form
   2,421.32/3,629.46 = 1,121.72/x
3. Step 3: Cross multiply
   2,421.32x = 3,629.46 × 1,121.72
4. Step 4: Simplify right side
   2,421.32x = 4,071,237.87
5. Step 5: Solve for x
   x = 4,071,237.87/2,421.32
6. Step 6: Final answer
   x = 1,681.41