Finding the Fourth Proportional to 2,865.50, 4,298.38 and 917.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,865.50 : 4,298.38 = 917.72 : x
2. Step 2: Convert to fraction form
   2,865.50/4,298.38 = 917.72/x
3. Step 3: Cross multiply
   2,865.50x = 4,298.38 × 917.72
4. Step 4: Simplify right side
   2,865.50x = 3,944,709.29
5. Step 5: Solve for x
   x = 3,944,709.29/2,865.50
6. Step 6: Final answer
   x = 1,376.62