Finding the Fourth Proportional to 1,131.65, 1,696.77 and 644.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.65 : 1,696.77 = 644.03 : x
2. Step 2: Convert to fraction form
   1,131.65/1,696.77 = 644.03/x
3. Step 3: Cross multiply
   1,131.65x = 1,696.77 × 644.03
4. Step 4: Simplify right side
   1,131.65x = 1,092,770.78
5. Step 5: Solve for x
   x = 1,092,770.78/1,131.65
6. Step 6: Final answer
   x = 965.64