Finding the Fourth Proportional to 2,311.15, 3,465.34 and 903.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.15 : 3,465.34 = 903.89 : x
2. Step 2: Convert to fraction form
   2,311.15/3,465.34 = 903.89/x
3. Step 3: Cross multiply
   2,311.15x = 3,465.34 × 903.89
4. Step 4: Simplify right side
   2,311.15x = 3,132,302.46
5. Step 5: Solve for x
   x = 3,132,302.46/2,311.15
6. Step 6: Final answer
   x = 1,355.30