Finding the Fourth Proportional to 2,766.52, 4,150.05 and 917.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,766.52 : 4,150.05 = 917.20 : x
2. Step 2: Convert to fraction form
   2,766.52/4,150.05 = 917.20/x
3. Step 3: Cross multiply
   2,766.52x = 4,150.05 × 917.20
4. Step 4: Simplify right side
   2,766.52x = 3,806,425.86
5. Step 5: Solve for x
   x = 3,806,425.86/2,766.52
6. Step 6: Final answer
   x = 1,375.89