Finding the Fourth Proportional to 2,658.12, 3,987.54 and 926.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.12 : 3,987.54 = 926.28 : x
2. Step 2: Convert to fraction form
   2,658.12/3,987.54 = 926.28/x
3. Step 3: Cross multiply
   2,658.12x = 3,987.54 × 926.28
4. Step 4: Simplify right side
   2,658.12x = 3,693,578.55
5. Step 5: Solve for x
   x = 3,693,578.55/2,658.12
6. Step 6: Final answer
   x = 1,389.55