Finding the Fourth Proportional to 1,131.32, 1,561.26 and 711.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.32 : 1,561.26 = 711.80 : x
2. Step 2: Convert to fraction form
   1,131.32/1,561.26 = 711.80/x
3. Step 3: Cross multiply
   1,131.32x = 1,561.26 × 711.80
4. Step 4: Simplify right side
   1,131.32x = 1,111,304.87
5. Step 5: Solve for x
   x = 1,111,304.87/1,131.32
6. Step 6: Final answer
   x = 982.31