Finding the Fourth Proportional to 2,766.81, 4,149.71 and 917.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.81 : 4,149.71 = 917.72 : x
2. Step 2: Convert to fraction form
   2,766.81/4,149.71 = 917.72/x
3. Step 3: Cross multiply
   2,766.81x = 4,149.71 × 917.72
4. Step 4: Simplify right side
   2,766.81x = 3,808,271.86
5. Step 5: Solve for x
   x = 3,808,271.86/2,766.81
6. Step 6: Final answer
   x = 1,376.41