Finding the Fourth Proportional to 2,658.42, 3,987.81 and 903.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.42 : 3,987.81 = 903.71 : x
2. Step 2: Convert to fraction form
   2,658.42/3,987.81 = 903.71/x
3. Step 3: Cross multiply
   2,658.42x = 3,987.81 × 903.71
4. Step 4: Simplify right side
   2,658.42x = 3,603,833.74
5. Step 5: Solve for x
   x = 3,603,833.74/2,658.42
6. Step 6: Final answer
   x = 1,355.63