Finding the Fourth Proportional to 2,155.40, 2,976.20 and 1,757.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.40 : 2,976.20 = 1,757.12 : x
2. Step 2: Convert to fraction form
   2,155.40/2,976.20 = 1,757.12/x
3. Step 3: Cross multiply
   2,155.40x = 2,976.20 × 1,757.12
4. Step 4: Simplify right side
   2,155.40x = 5,229,516.88
5. Step 5: Solve for x
   x = 5,229,516.88/2,155.40
6. Step 6: Final answer
   x = 2,426.25