Finding the Fourth Proportional to 2,629.42, 3,946.55 and 1,331.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.42 : 3,946.55 = 1,331.80 : x
2. Step 2: Convert to fraction form
   2,629.42/3,946.55 = 1,331.80/x
3. Step 3: Cross multiply
   2,629.42x = 3,946.55 × 1,331.80
4. Step 4: Simplify right side
   2,629.42x = 5,255,998.89
5. Step 5: Solve for x
   x = 5,255,998.89/2,629.42
6. Step 6: Final answer
   x = 1,998.92