Finding the Fourth Proportional to 1,557.52, 2,149.67 and 960.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.52 : 2,149.67 = 960.21 : x
2. Step 2: Convert to fraction form
   1,557.52/2,149.67 = 960.21/x
3. Step 3: Cross multiply
   1,557.52x = 2,149.67 × 960.21
4. Step 4: Simplify right side
   1,557.52x = 2,064,137.03
5. Step 5: Solve for x
   x = 2,064,137.03/1,557.52
6. Step 6: Final answer
   x = 1,325.27