Finding the Fourth Proportional to 2,758.79, 4,137.31 and 909.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.79 : 4,137.31 = 909.50 : x
2. Step 2: Convert to fraction form
   2,758.79/4,137.31 = 909.50/x
3. Step 3: Cross multiply
   2,758.79x = 4,137.31 × 909.50
4. Step 4: Simplify right side
   2,758.79x = 3,762,863.90
5. Step 5: Solve for x
   x = 3,762,863.90/2,758.79
6. Step 6: Final answer
   x = 1,363.95