Finding the Fourth Proportional to 1,557.72, 2,148.89 and 960.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.72 : 2,148.89 = 960.39 : x
2. Step 2: Convert to fraction form
   1,557.72/2,148.89 = 960.39/x
3. Step 3: Cross multiply
   1,557.72x = 2,148.89 × 960.39
4. Step 4: Simplify right side
   1,557.72x = 2,063,772.47
5. Step 5: Solve for x
   x = 2,063,772.47/1,557.72
6. Step 6: Final answer
   x = 1,324.87