Finding the Fourth Proportional to 2,429.60, 3,640.61 and 1,129.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,429.60 : 3,640.61 = 1,129.55 : x
2. Step 2: Convert to fraction form
   2,429.60/3,640.61 = 1,129.55/x
3. Step 3: Cross multiply
   2,429.60x = 3,640.61 × 1,129.55
4. Step 4: Simplify right side
   2,429.60x = 4,112,235.65
5. Step 5: Solve for x
   x = 4,112,235.65/2,429.60
6. Step 6: Final answer
   x = 1,692.56