Finding the Fourth Proportional to 2,689.50, 4,031.94 and 933.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.50 : 4,031.94 = 933.40 : x
2. Step 2: Convert to fraction form
   2,689.50/4,031.94 = 933.40/x
3. Step 3: Cross multiply
   2,689.50x = 4,031.94 × 933.40
4. Step 4: Simplify right side
   2,689.50x = 3,763,431.57
5. Step 5: Solve for x
   x = 3,763,431.57/2,689.50
6. Step 6: Final answer
   x = 1,399.31