Finding the Fourth Proportional to 2,289.72, 3,158.70 and 1,357.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.72 : 3,158.70 = 1,357.56 : x
2. Step 2: Convert to fraction form
   2,289.72/3,158.70 = 1,357.56/x
3. Step 3: Cross multiply
   2,289.72x = 3,158.70 × 1,357.56
4. Step 4: Simplify right side
   2,289.72x = 4,288,124.77
5. Step 5: Solve for x
   x = 4,288,124.77/2,289.72
6. Step 6: Final answer
   x = 1,872.77