Finding the Fourth Proportional to 1,131.89, 1,560.75 and 711.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.89 : 1,560.75 = 711.73 : x
2. Step 2: Convert to fraction form
   1,131.89/1,560.75 = 711.73/x
3. Step 3: Cross multiply
   1,131.89x = 1,560.75 × 711.73
4. Step 4: Simplify right side
   1,131.89x = 1,110,829.04
5. Step 5: Solve for x
   x = 1,110,829.04/1,131.89
6. Step 6: Final answer
   x = 981.39