Finding the Fourth Proportional to 1,131.55, 1,560.27 and 711.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.55 : 1,560.27 = 711.39 : x
2. Step 2: Convert to fraction form
   1,131.55/1,560.27 = 711.39/x
3. Step 3: Cross multiply
   1,131.55x = 1,560.27 × 711.39
4. Step 4: Simplify right side
   1,131.55x = 1,109,968.99
5. Step 5: Solve for x
   x = 1,109,968.99/1,131.55
6. Step 6: Final answer
   x = 980.93