Finding the Fourth Proportional to 1,131.84, 1,560.96 and 711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.84 : 1,560.96 = 711.72 : x
2. Step 2: Convert to fraction form
   1,131.84/1,560.96 = 711.72/x
3. Step 3: Cross multiply
   1,131.84x = 1,560.96 × 711.72
4. Step 4: Simplify right side
   1,131.84x = 1,110,966.45
5. Step 5: Solve for x
   x = 1,110,966.45/1,131.84
6. Step 6: Final answer
   x = 981.56