Finding the Fourth Proportional to 1,131.51, 1,557.78 and 964.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.51 : 1,557.78 = 964.75 : x
2. Step 2: Convert to fraction form
   1,131.51/1,557.78 = 964.75/x
3. Step 3: Cross multiply
   1,131.51x = 1,557.78 × 964.75
4. Step 4: Simplify right side
   1,131.51x = 1,502,868.26
5. Step 5: Solve for x
   x = 1,502,868.26/1,131.51
6. Step 6: Final answer
   x = 1,328.20