Finding the Fourth Proportional to 2,661, 3,998.73 and 1,429.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661 : 3,998.73 = 1,429.31 : x
2. Step 2: Convert to fraction form
   2,661/3,998.73 = 1,429.31/x
3. Step 3: Cross multiply
   2,661x = 3,998.73 × 1,429.31
4. Step 4: Simplify right side
   2,661x = 5,715,404.78
5. Step 5: Solve for x
   x = 5,715,404.78/2,661
6. Step 6: Final answer
   x = 2,147.84