Finding the Fourth Proportional to 2,658.40, 3,994.64 and 1,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.40 : 3,994.64 = 1,426.72 : x
2. Step 2: Convert to fraction form
   2,658.40/3,994.64 = 1,426.72/x
3. Step 3: Cross multiply
   2,658.40x = 3,994.64 × 1,426.72
4. Step 4: Simplify right side
   2,658.40x = 5,699,232.78
5. Step 5: Solve for x
   x = 5,699,232.78/2,658.40
6. Step 6: Final answer
   x = 2,143.86