Finding the Fourth Proportional to 2,865.40, 4,298.42 and 917.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,865.40 : 4,298.42 = 917.16 : x
2. Step 2: Convert to fraction form
   2,865.40/4,298.42 = 917.16/x
3. Step 3: Cross multiply
   2,865.40x = 4,298.42 × 917.16
4. Step 4: Simplify right side
   2,865.40x = 3,942,338.89
5. Step 5: Solve for x
   x = 3,942,338.89/2,865.40
6. Step 6: Final answer
   x = 1,375.84