Finding the Fourth Proportional to 3,145.50, 4,690.79 and 2,757.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.50 : 4,690.79 = 2,757.30 : x
2. Step 2: Convert to fraction form
   3,145.50/4,690.79 = 2,757.30/x
3. Step 3: Cross multiply
   3,145.50x = 4,690.79 × 2,757.30
4. Step 4: Simplify right side
   3,145.50x = 12,933,915.27
5. Step 5: Solve for x
   x = 12,933,915.27/3,145.50
6. Step 6: Final answer
   x = 4,111.88