Finding the Fourth Proportional to 1,141.80, 1,572.76 and 964.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.80 : 1,572.76 = 964.56 : x
2. Step 2: Convert to fraction form
   1,141.80/1,572.76 = 964.56/x
3. Step 3: Cross multiply
   1,141.80x = 1,572.76 × 964.56
4. Step 4: Simplify right side
   1,141.80x = 1,517,021.39
5. Step 5: Solve for x
   x = 1,517,021.39/1,141.80
6. Step 6: Final answer
   x = 1,328.62