Finding the Fourth Proportional to 2,866.72, 4,298.40 and 917.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,866.72 : 4,298.40 = 917.92 : x
2. Step 2: Convert to fraction form
   2,866.72/4,298.40 = 917.92/x
3. Step 3: Cross multiply
   2,866.72x = 4,298.40 × 917.92
4. Step 4: Simplify right side
   2,866.72x = 3,945,587.33
5. Step 5: Solve for x
   x = 3,945,587.33/2,866.72
6. Step 6: Final answer
   x = 1,376.34