Finding the Fourth Proportional to 1,131.72, 1,561.68 and 711.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.72 : 1,561.68 = 711.96 : x
2. Step 2: Convert to fraction form
   1,131.72/1,561.68 = 711.96/x
3. Step 3: Cross multiply
   1,131.72x = 1,561.68 × 711.96
4. Step 4: Simplify right side
   1,131.72x = 1,111,853.69
5. Step 5: Solve for x
   x = 1,111,853.69/1,131.72
6. Step 6: Final answer
   x = 982.45