Finding the Fourth Proportional to 2,228.72, 3,340.76 and 928.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,228.72 : 3,340.76 = 928.40 : x
2. Step 2: Convert to fraction form
   2,228.72/3,340.76 = 928.40/x
3. Step 3: Cross multiply
   2,228.72x = 3,340.76 × 928.40
4. Step 4: Simplify right side
   2,228.72x = 3,101,561.58
5. Step 5: Solve for x
   x = 3,101,561.58/2,228.72
6. Step 6: Final answer
   x = 1,391.63