Finding the Fourth Proportional to 1,131.75, 1,561.55 and 659.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.75 : 1,561.55 = 659.36 : x
2. Step 2: Convert to fraction form
   1,131.75/1,561.55 = 659.36/x
3. Step 3: Cross multiply
   1,131.75x = 1,561.55 × 659.36
4. Step 4: Simplify right side
   1,131.75x = 1,029,620.31
5. Step 5: Solve for x
   x = 1,029,620.31/1,131.75
6. Step 6: Final answer
   x = 909.76