Finding the Fourth Proportional to 3,109.05, 4,662.72 and 917.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.05 : 4,662.72 = 917.55 : x
2. Step 2: Convert to fraction form
   3,109.05/4,662.72 = 917.55/x
3. Step 3: Cross multiply
   3,109.05x = 4,662.72 × 917.55
4. Step 4: Simplify right side
   3,109.05x = 4,278,278.74
5. Step 5: Solve for x
   x = 4,278,278.74/3,109.05
6. Step 6: Final answer
   x = 1,376.07